'Dam' in the Bible

If a bird's nest chance to be before thee in the way, in any tree, or upon the ground, with young or with eggs, and the dam sitting upon the young or upon the eggs, thou shalt not take the dam with the young:

thou shalt in any case let the dam go, and thou mayest take the young to thee, that it may be well with thee, and that thou mayest prolong thy days.