breed - v. to produce young animals, birds and so on, or to produce offspring by sexual reproduction

breeding ground – n. a place where animals go to breed

chick - n. a baby bird

scale - n. the size or level of something especially in comparison to something else

incubate - v. to sit on eggs so that they will be kept warm and will hatch (break open and produce young)

refuge - n. a place that provides shelter or protection