42. Generally how does a male
animal realize that the female
is receptive to copulation?

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In most vertebrate species internal
fecundation the females
reproductive cycles with fertile .
During this period the secretes
pheromones (odoriferous substances
attract the male of species)
from the skin mucosae. The
presence of male individual and his
also stimulates the release
pheromones by the female. (
animals also use pheromones
territorial demarcation and for
transmission between individuals about
location of dangers and .)