brood spot


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brood spot

or

patch

a prolactin-induced (see LUTEOTROPHIC HORMONE bare layer of skin in birds from which feathers are virtually absent and which receives a rich blood supply. Such patches are used to incubate the eggs.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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