5 bad-but-good things about field work

No food that you can’t cook by adding boiling water or wrapping it in aluminum foil and sticking it in a campfire. On the one hand, you’d be surprised what turns out to be delicious wrapped in foil and cooked in a campfire—mushrooms, tomatoes, peaches, spinach—and you get to eat a lot of s’mores and Nutella.* And you gain a real, passionate appreciation for kitchen-cooked food; my field assistants and I can spend hours rhapsodizing about the food we wish we were eating. On the other hand, we make ourselves desperately hungry for pesto and pizza and Homeroom mac&cheese, and then have to eat dehydrated black bean soup. And the food appreciation never seems to last long enough for us to appreciate it when we actually have kitchens. Case in point: I’m at home now, capable of making all sorts of delicious things that I’ve craved while in the field, and I’m having a root beer float for breakfast.

*Unless you’re doing really serious, backpacking-type field work, in which case no fresh fruits or Nutella for you! Dehydrated soup all day, every day. That’s pretty rough.

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What do birds see?

Another great question from James:

When certain birds (not owls) look out at you from their left eye, they can’t see you with their right eye on the other side of its head. So what do birds with eyes on both sides of the head actually see? Two different scenes? Or some sort of panorama distillation?

What does LAGG see?

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A bird in the hand

What happens when we catch a junco:

We band it with the uniquely numbered US Fish & Wildlife band. This is the first priority because once the bird has this on, we can identify it later even if it escapes. Then we add the three colored leg bands so that we can identify it later even from a distance.

GOAL with his leg bands

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Featured paper: nest predation

Corey Tarwater. 2008. Predators at nests of the Western Slaty Antshrike (Thamnophilus atrinucha). The Wilson Journal of Ornithology, volume 120(3): pp 620-624.

Nest predation is a major worry for most birds. Chicks in the nest are essentially helpless, and parents usually can’t do much to stop predators, although they will try. Losing broods to predation is common. In this study, 79% of nests were lost to predation. If you’re a Western Slaty Antshrike, you can expect 4 out of every 5 broods of chicks you have to get eaten!

Yet actually seeing these—or any—predation events is extremely rare. Dr. Tarwater describes five nest predation events on Western Slaty Antshrikes (small, cryptic brownish birds) in Panama, one she observed in person and the rest of which she caught on video.

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Featured paper: fledging House Wrens are funny

(This will be a regular feature: blurbs about papers I like.)

Today’s paper: “The process and causes of fledging in a cavity-nesting passerine bird, the House Wren (Troglodytes aedon)” by L. Scott Johnson, Robin L. Rauch, and Sara N. Dellone. Published in 2004 in Ethology 110, pages 693-705.

Fledging is the act of leaving the nest for the first time. In birds with altricial (helpless, naked, dependent) young, this is a big step: the chicks go from sitting in a nest to flying around like adult birds. Or trying to fly around, anyway. Fledglings often aren’t very good at flying at first.

A rehabbed House Wren nestling (and messy eater) nearly ready to fledge

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Follow-up: almost nobody understands mirrors

Since several people have contacted me to defend junco intelligence after the mirror post yesterday, I thought I might talk a bit more about birds and mirrors.

Very, very few species understand mirrors, and an enormous majority of them behave as if the mirrored images are real, as the junco did. The list of birds that do not recognize themselves in the mirror is long: Budgerigar; House Sparrow; Kea; Black-capped Chickadee; Zebra Finch; Cedar Waxwing; Glaucous-winged Gull; Blue Grouse; Peach-faced Lovebird; reviewed in (1). In 1964, Edith Andrews kept an injured junco in a cage with a mirror and observed that it was quieted by the mirror, liked to perch next to it, and “appeared to be smitten with its own image” (2).

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