What are birds up to down there? Part 1 of 2
Sep 25, 2019
What are they up to down there? Part 1 of 2
It’s easy to assume that we know all about them. We watch for them as they arrive and study them while they are courting, breeding, parenting, and even molting. But the truth is, most migrating songbirds spend only four or five months here before they head back to Central America, South America or the West Indies, where they live the rest of the year. What are they up to while they’re down there?
For starters, they eat. That’s one of the things these birds can’t do up here in winter and a major reason they don’t stay. Most long-distance migrants are insectivores and/or nectar eaters. Temperate climates don’t support enough insects or flowers in winter to sustain birds through the colder season. The migrants seem to have a better chance of surviving a round trip of 3,000 to 5,000 miles than sitting out a winter in North America.
Another thing birds do is hide. Well, maybe not exactly hide, but they don’t stand out the way they do in breeding season either. Although they are not silent by any means, their best songs are saved for defending a territory and for attracting a mate. And some species look completely different in their alternate plumage. Not all warblers, for instance, put on drab winter feathers, but enough do to earn several pages of “confusing fall warblers” in many field guides. In winter plumage, warblers, tanagers, and buntings disappear in the leaves and shadows of tropical forests.
They also socialize down there. Warblers that are strictly territorial on summer breeding grounds, such as the Northern Parula and Blue-winged Warblers, can be found in loose, mixed-species flocks in winter. This probably reflects a lack of space in this more crowded winter habitat
Next time: Feeding, protection and habitat needs “down there”.