Robin who?

Posted by: Sheri | May 21, 2014

Review: Feeder Fresh Nectar Defender

(Originally submitted at Duncraft, which I do not patronize because it sells various overpriced “nectar” products that contain artificial dyes, preservatives, and/or other potentially harmful additives that don’t belong in hummingbird feeders.)

A bad idea

1out of 5

The active ingredient in this product is reportedly copper, which is an essential micro-nutrient at natural (low) intake levels and a potentially toxic heavy metal at higher doses. The fact that copper accumulates in birds’ bodies combined with hummingbirds’ extreme appetites increases the risk that the copper in this product will accumulate over time to levels that may cause scientifically documented problems such as behavioral changes, developmental abnormalities, reduced egg production and nestling survival, etc. That’s a pretty high price to pay for reducing feeder maintenance.

When they can’t get off the ground.

Image

To survive their epic migrations, Rufous Hummingbirds may double their body weight by converting energy-rich sugar into energy-rich fat.

Seriously, a wild, free-living hummingbird can’t get too fat. Fat is fuel for migration, and they pack on the grams as necessary to prepare for travel and shed them just as quickly when the journey is over.

Posted by: Sheri | December 13, 2013

What Not To Wear Cranewatching

The Sandhill Cranes that winter at Whitewater Draw Wildlife Area have learned that humans are mostly harmless within the no-hunting zone.

The Sandhill Cranes that winter at Whitewater Draw Wildlife Area have grown accustomed to crowds of humans ogling them from the trails and viewing platforms.

Sandhill Cranes have returned to southeastern Arizona for the winter, and I’ll be visiting the flock at Whitewater Draw Wildlife Area almost every weekend between now and the end of February. When you have the privilege of spending a lot of time with cranes, you get to see lots of interesting behavior and interactions. Some are hard to miss, but the subtle ones can be the most educational.

One Sunday last February, I was leading a crane watch activity for the public on one of the viewing platforms at the wildlife area. Uncommonly cold temperatures that day kept most visitors away, but a handful of hardy souls joined me to watch the midday crane fly-in. The viewing platform has no roof or walls to block the wind, but spectacular unobstructed views of thousands of cranes made the eye-watering cold worth braving.

Drought had shrunk the playa lake to its lowest level in many years, and the scarcity of open water encouraged the cranes to land even closer to the viewing area than usual. They dropped in a few dozen yards in front of the platform, often skating across patches of ice (and sometimes falling down). The nearest birds cautiously picked their way across the frozen mud to a narrow band of open water a few yards from the platform and bent their long, graceful necks to drink. Camera shutters clicked madly, recording the spectacle.

The idyllic mood was broken by a sudden commotion east of the platform: a group of cranes scuttling warily away from a popular viewing spot on the trail, their necks extended and red crowns expanded in alarm. Peering through the leafless willows to see what had frightened the cranes, we saw four men dressed in varying degrees of hunting camouflage. All wore shirts and billed caps in camo patterns, and at least one wore coordinating pants. They weren’t accompanied by a dog (whose mere presence, even leashed, is known to have negative effects on birds and other wildlife), and none were carrying rifles or shotguns.

A dozen or so people in street clothes of various colors and at least three leashed dogs had already walked past that same spot without discouraging the cranes from approaching the trail. Maybe one of the men pantomimed shooting at the cranes, but it seems more likely that the older, more experienced members of the flock had learned to associate camo-clad humans with danger and reacted to the clothing alone.

Though I’m a strong proponent of dressing inconspicuously for birding, this experience has caused me to have second thoughts about whether hunting-style camo is a good choice for field wear, at least for watching cranes and other hunted birds.

Posted by: Sheri | December 10, 2013

Beware the wrath of the birding legions!

A Snowy Owl at Benton Lake National Wildlife Refuge in Montana, safe from murderous bureaucrats and and Silver-bellied Gashawks.

A Snowy Owl at Benton Lake National Wildlife Refuge in Montana,
safe from murderous bureaucrats and and Silver-bellied Gashawks.
CC image courtesy of USFWS Mountain-Prairie on Flickr.

(Title borrowed from a column by the late, great Molly Ivins.)

On Monday morning, the New York Daily News broke a story about the Port Authority killing Snowy Owls at airports in New York City. Follow-up articles contrasted trigger-happy NYC with the more responsible and humane policies of Boston’s Logan Airport (a famous location for wintering Snowy Owls). The story quickly spread via Facebook, prompting a petition and phone campaign to stop the carnage (three owls had already been shotgunned by the PA’s euphemistically named “wildlife specialists” after five others struck planes).

Usually such efforts take days, weeks, or months to bear fruit, and some never do, but by Monday evening the PA had come around and agreed to stop slaughtering the owls and cooperate with trapping and relocation. The outrage from the public, including the birding community, was so swift and so fierce that it overcame bureaucratic inertia.

Every day on social media we see calls to action in support of one good cause or another or against the latest outrage. It’s good to know that raising our voices and signing our names can make a difference.

“Never doubt that a small group of thoughtful, committed citizens can change the world; indeed, it’s the only thing that ever has.”  — Margaret Mead

Posted by: Sheri | December 9, 2013

Rethinking winter hummingbirds

This post is adapted from an article that originally appeared in 2010 in my “Out the Window” column in WildBird magazine. Though the focus is vagrant hummingbirds of migratory species, many of the issues apply equally to semi-migratory hummingbirds such as Anna’s that have expanded their range into areas where winter survival depends on feeders. 

Anna's Hummingbirds are the most cold-tolerant of any North American species, but even they can't survive extended periods of subfreezing weather without help from their human hosts.

A hungry male Anna’s Hummingbird fills his crop moments after a thick layer of fresh snow was brushed off the feeder. Anna’s are the most cold-tolerant of all North American hummingbirds, but even they can’t survive extended periods of subfreezing weather without help from their human hosts.

For more than 20 years I’ve been telling people that it takes more than a bottle of sugar water to keep a healthy hummingbird on the breeding grounds when its instincts tell it to head south. Though that’s still true, it doesn’t apply to the increasing numbers of vagrant hummingbirds whose instincts lead them not to the tropics or the relatively mild southern and coastal parts of the U.S. but to cold latitudes where their chances of long-term survival are slim.

In some cases, these seemingly lost and doomed migrants do make it through the winter with a little help from their human friends, even surviving to return the following fall. It’s the less fortunate ones and the dilemmas they pose for their hosts and admirers that caused me to rethink my longstanding advice to leave hummingbird feeders up in fall.

The vast majority of wild birds live and die without a single human ever taking a personal interest in their welfare, but hummingbirds aren’t most birds. Their deceptive daintiness and apparent dependence on our gardens and feeders trigger much stronger and more complex emotions in us. Small wonder, then, that firestorms of controversy often erupt over whether, when, and how to help vagrant hummingbirds that are struggling to cope with brutal northern winters.

Unfortunately, there’s no one-size-fits-all approach to dealing with tiny birds in trouble. A hands-off policy, as heartless as it may seem, would be the logical choice if wintering hummingbirds were getting by entirely on natural resources. Once artificial feeders and the people who tend them enter the picture, “letting nature take its course” is no longer an option. It’s not so easy to talk about natural selection when you have to look that hummingbird in the eye each morning as it huddles on its slushy feeder.

Intervention has its own hazards, even when left to licensed experts (as required by federal law). The “Three Rs”— Rescue, Rehabilitate, and Release—may fail if delayed until the bird is too weak to survive the stress of capture or if the specialized care it needs is unavailable. Some wildlife rescue groups are reluctant to take in hummingbirds because they don’t have the expertise or resources to provide proper care.

New problems arise when the rescuers decide to add a fourth “R”: Relocate. It was once common practice to capture vagrant hummingbirds, even those in no obvious distress, and fly or drive them hundreds of miles to warmer climes. As we learned more about hummingbird migration, we realized that in most cases this is a spectacularly bad idea. Like many other birds, hummingbirds learn the particulars of their migration routes by experience. Without that experience, a bird that manages to survive capture and relocation may end up permanently disoriented. Release at or near the original rescue site allows the bird to reorient itself to familiar landmarks in preparation for the next leg of its journey, whether further south or back towards its breeding grounds.

When to release a rescued hummingbird can be just as important as where, especially for early-migrating species such as Rufous and Allen’s. Their northward migration along the Pacific Coast is well underway in January and February, when much of the U.S. is still in the grip of winter. Releasing a hummingbird in the dead of winter isn’t as crazy as it may sound. Some of the tougher species have been observed to hang on through blizzards and ice storms only to move on once the weather cleared.

This Pine Warbler is no better adapted to winter weather than most hummingbirds, but few people would advocate capturing it for relocation or incarceration in a zoo.

This Pine Warbler is no better adapted to winter weather than most hummingbirds, but few people would advocate capturing it for relocation or permanent captivity.

Another misguided approach is to sentence “defective” hummingbirds to life in captivity. Though modern zoo ethics discourage taking wildlife out of the wild, this was exactly what happened to a Green-breasted Mango that found its way to southern Wisconsin in the autumn of 2007. This spectacular bird, only the second member of its mainly tropical species ever seen north of southern Texas, was preemptively rescued ahead of a winter storm and transported to a wildlife rehabilitation center. Against the advice of numerous hummingbird experts, center officials decided to turn the bird over to the Brookfield Zoo in Chicago. Members of the hummingbird community lobbied for the bird’s release either back in Wisconsin or in the lower Rio Grande Valley of Texas, but zoo officials were determined to add this avian celebrity to the collection. The following fall a late-migrating Ruby-throated from Michigan ended up at the same zoo under similar circumstances, again against the advice of experts.

How do we keep hummingbirds out of these predicaments in the first place? One simple change in your feeder routine could make a huge difference. Switching to a sugar-water ratio of 1:3 by early September, when high-risk birds may be passing through, will help your visitors put on fat more efficiently while still providing essential water. The higher sugar content also lowers the solution’s freezing temperature without making it too syrupy for hummingbirds to drink, so it’s the perfect recipe for winter feeding as well. Most hummingbirds take to the sweeter solution right away, but you can gradually increase the sugar content over several days to avoid alienating your regular clientele.

Of course, the ultimate solution to the problem is to stop feeding hummingbirds before winter sets in. If you live north of USDA Plant Hardiness Zone 7a  (average minimum winter temperatures 5 to 10̊ F.) and would prefer not to take on the responsibility of hosting a wintering hummingbird, simply take down your feeders within a week after the first frost even if there are still hummingbirds around. You’ll still be providing a boost to tardy migrants without encouraging any wayward travelers to consider your yard as a possible winter refuge.

Hummingbirds should be dusted with pollen, not pesticides.

Hummingbirds should be dusted with pollen, not pesticides.

NO! Sevin is an indiscriminate pesticide that’s considered moderately toxic to birds. Even if it doesn’t kill hummingbirds outright, it will kill their prey and deprive them of a vital food source. There are many safer and more targeted solutions available for controlling garden and household pests.

Mother Earth News: Organic Pest Control: What Works, What Doesn’t

About.com: Natural & Organic Pest Control Solutions for the Garden

Grist: A guide to non-toxic pest control

Rufous/Allen's hummingbird at feeder

A young Rufous/Allen’s hummingbird drinking on a hot summer afternoon.

Of course they can, as long as it’s not straight out of a solar water heater.

But don’t take my word for it when you can easily prove it to yourself. Leave your hummingbird feeder in full sun for a few hours on a hot summer day, then check the temperature of the sugar water.

Unless you’ve hung your feeder near a highly reflective surface and/or inside an enclosed greenhouse-like space, the liquid won’t be much warmer than the surrounding air. This is because a relatively small small volume of liquid in an uninsulated container loses heat to the surrounding air about as fast as it gains it.

Hummingbirds are not delicate, fragile creatures. If the feeder solution isn’t hot enough to damage human skin, it’s not going to burn their tongues.

Addendum, June 23, 2014: A complete answer to this question involves numbers, and I finally got around to getting some on a hot afternoon here in the high desert of southern Arizona:

  • Air temperature in full sun: 95° F. (35° C.)*
  • Feeder solution temperature in full sun: 105° F. (40.6° C.)*

For comparison:

  • Hummingbird body temperature: ~104° F. (~40° C.)
  • Highest air temperature ever recorded in the U.S.: 134° F (56.7° C).
  • Optimum hot beverage temperature: 136° F (57.8° C).
  • Water hot enough to cause third-degree burns to human skin in 5 seconds: 140° F. (60° C.)
  • McDonald’s coffee, pre-lawsuit: 180–190° F. (82–88° C.)

* Air and sugar water temperature measured with a cooking thermometer in my yard at around 2 p.m.; the feeder is a fancy HummZinger with a translucent top, which probably adds a little greenhouse effect to the direct solar heating.

References:

LiveScience: What’s the highest temperature ever recorded in the U.S.?

Brown F., and K.R. Diller. 2008. Calculating the optimum temperature for serving hot beverages. Burns Aug;34(5):648-54. Link (PubMed)

Wikipedia: Liebeck v. McDonald’s Restaurants

The Burn Foundation: Safety Facts on Scald Burns

Costa's Hummingbird

Costa’s Hummingbirds are true desert dwellers, but all North American hummingbirds can tolerate summer heat if they have plenty of water.

Yes. They’ve been doing it for millions of years. As long as they’ve got shelter from the sun and plenty of water for evaporative cooling, they should be fine.

Hummingbirds will drink plain water when conditions are particularly hot and dry and/or nectar is hard to come by, but the usual sources of water pose risks of disease transmission from other birds, poisoning from rain or irrigation runoff contaminated with pesticides, weed killers, oil, antifreeze, etc. It’s safer to put out a separate feeder filled with plain water or change the sugar-to-water ratio of your feeder solution.

When the daytime highs start creeping into the 90s F., I reduce the concentration of my solution to 1 part sugar to 4 parts water. When temperatures rise to over 100° F. (which they don’t very often here in the high desert), I back off to 1:5. In parts of the Southwest where temperatures are topping 110° F., a 1:6 ratio would be advisable. Weaker solutions tend to spoil faster, but on the plus side they also tend to be less attractive to bees.

Providing water for the outside of the bird is another way to help beat the heat. I added a mister to our drip irrigation system that runs for a few minutes a day, spraying into the foliage over my hummingbird garden. It’s used year round but is especially appreciated in summer, helping to keep the birds cool and their insulating plumage in top condition.

I hate to end on a down note, but the hard fact is that every organism on Earth is going to have to adapt to rising average temperatures and greater extremes, and those that aren’t well suited to withstand “the new normal” just won’t survive.

Reference:

Hiebert, S.M. and W.A. Calder III. 1986. The osmoregulatory consequences of nectarivory and frugivory in hummingbirds and other species. Proc. XIX Internat. Ornith. Cong ., Ottawa, Canada.

Related post:

Feeder Solution Evolution Part I: The basics

3 Rufous, 1 Costa'sBecause hummingbirds aren’t humans, as I’ve pointed out here before, and one species’ meat is another species’ poison.

We modern humans are large, sedentary primates whose evolution hasn’t prepared us for our current unnatural abundance of calorie-dense foods, including sugars. We eat vastly more sugars than our ancestors did, and we pay the price in obesity, insulin resistance, type 2 diabetes, and other problems. *

Hummingbirds, on the other hand, are tiny, hyperactive creatures with raging metabolisms fueled in large part by naturally concentrated sugar sources (primarily flower nectar). Our smaller northern species need at minimum the caloric equivalent of ~40% of their body weight in sugar every day just to function. Even at our elevated consumption levels, it would take the average American more than six months to eat 40% of his or her body weight in sugar.

All plants manufacture sugars in their tissues, and many use them to bribe animals for pollination services. Sucrose, a naturally occurring sugar that most of us know as white table sugar, is the main sugar found in the nectars of hummingbird-pollinated flowers and so is the most natural ingredient to put in hummingbird feeders. We get our sucrose from the sap of sugar cane and sugar beets, but it’s chemically identical to the sucrose in flower nectar. (Refining sugar isn’t like refining oil; it involves filtering the contaminants out of the plant juices, including some that are dangerous to hummingbirds, and crystallizing the purified sugars.) 

* I’ve also said here before that sugar doesn’t cause diabetes, based on assurances by ostensibly credible organizations, but recent research has established a very strong correlation between sugar availability and type 2 diabetes. It appears that Big Sugar took a page from Big Tobacco’s playbook and worked tirelessly for decades to keep the public from learning the facts about their product.

Related posts:

Feeder Solution Evolution Part 1: The basics

Search of the Week: “why don’t hummingbirds get diabetes?”

Search of the Week: “is molasses ok to feed hummingbirds”

Beet juice in hummingbird feeders? NO!

Vampire hummingbird expert + urban myth remix

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