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The general body plan of procellari- iform birds varies slightly from family to
family. In general, they are long-winged, short-necked birds with short to
moderate tails and legs. Webbing is present between the front toes, and the
hindtoe (hallux) ...
The nest cavity varies with the size of the bird. A flicker (30 centimetres, or 1 2
inches, long) was found incubating eggs in a tree stub only 12 centimetres (five
inches) thick; so less space is required for nesting than one might expect.
But the intensity of light varies inversely with the square of the distance from the
source; thus, if a light fixture gives an intensity of 40 footcandles at a distance of
one metre, it will produce an intensity of 10 footcandles at two metres. Therefore ...
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