How well does the malthusian subsistence theory predict bird populations like our birds, at the margin of subsistence as a whole? A big ice storm will set carolina red populations at the edge of the range in new england or the mid atlantic for five years. It'll take em to rebound after that. And we can do experiments. Sometimes humming birds will defend a floral resource, and then when it gets big enough, they'll just give it up because there's no reason to do it any more.

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