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Saturday, September 29, 2012

The upside of fire is that it can be good for birds

Scientists at Cornell Laboratory of Ornithology say that a decrease in birds is linked to, among other things, human's urge to put out all forest fires, right away. Even those fires that don't endanger humans. They cite several situations where forest fires actually led to large increases in bird populations.

Pluses for birds are that forest fires consume dead logs, clearing spaces for new, native vegetation. Fires get rid of competing (and often invasive) vegetation, and cause several tree species to release seeds of new trees. Forest fires (which are predominantly a natural occurrence) add lots of carbon to the soil.  All this allows dense, new vegetation to grow, adding many, many new nesting sites and food sources.

Most birds migrate at night.  At night, the winds are calmer, making flight easier. At night, most predators aren't active, and the temperature is cooler. Most songbirds, however, are normally active during daylight only. So for a short period just prior to and during migratory flight, songbirds' bodies are adjusted naturally - an activity called "nocturnal restlessness".

In north Texas, we may see it as our hummingbirds migrate south for the winter. That's why I advise leaving nectar feeders up through the first week of October.  This helps feed stragglers from up north; and you may see your feeder a lot emptier each morning.

Wednesday, September 26, 2012

Dead trees are home to "cavity nesting" birds

A dead tree is somebody's home
The term "cavity nesters" is used for bird species that nest in old, probably-dead, trees. In north Texas that includes Chickadees, Titmice, Wrens and Bluebirds. These arborial homes were, probably, originally made by Woodpeckers, who lived there and raised a family. But all these birds are having a harder and harder time finding homes, because of humans' proclivity for cutting down all dead trees, and trees that just look sick.
                                    A dead tree left in place boosts the number of creatures dramatically. Watch this video.