For the Birds: Winter and birds

Here is the latest For the Birds column:

Photo by Chris Bosak A black-capped chickadee rests on an icy branch during a winter storm in Jan. 2019 in New England.

Winter poses serious challenges for birds and other wildlife.

The cold is the first thing that comes to mind. How do small birds such as chickadees and goldfinches survive sustained sub-zero temperatures? How do water birds such as gulls, ducks and geese stand on ice all day with bitter winds driving through them?

Birds that remain in New England all year have adapted to the low temperatures. Cold may be a challenge, but it’s one they can handle.

Chickadees and other birds have all sorts of adaptations to survive bitter cold days and nights. They increase their weight and fat percentage, they puff out their feathers to trap warm air close to their bodies, they huddle together for warmth, they drop their body temperature at night, and they eat a lot.

Water birds have an extra layer of down feathers to keep dry and toasty. Also, their legs don’t freeze because of a magical counter-current heat exchange between their veins and arteries. It’s not magic, of course, but it’s a complex system worthy of its own column. Let’s just say their feet don’t have to be as warm as their bodies (otherwise they’d be covered in feathers) and the way their blood flows keeps the legs from freezing.

So the cold, while uncomfortable on the most bitter nights, is usually Continue reading

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Ruby-throated Hummingbird drinking from berry

Photo by Chris Bosak A female Ruby-throated Hummingbird sips juice from a berry in Norwalk, Conn., summer 2014.

Photo by Chris Bosak
A female Ruby-throated Hummingbird sips juice from a berry in Norwalk, Conn., summer 2014.

Here are some more photos to accompany my most recent column in The Hour (Norwalk, Conn.) and The Keene Sentinel (Keene, N.H.)

Click here for the column.

Click below for more photos

Continue reading