[If] one takes a mother [bird] while on her young —- R' Yehudah says: He incurs the penalty of lashes, and he need not send [her] away. The Sages [however] say: He must send [her] away, and he does not incur the penalty of lashes. This is the rule: Any negative commandment that has in it a positive commandment bears no liability.

One who makes a bald spot on his head, or who rounds the corner of his head, or who destroys the corner of his beard, or who inflicts [upon himself] a single gash over someone who died —- he is liable. [If] he inflicted one gash over five people who died, or five gashes over one person who died —- he is liable for each one.  On the head: two —- one on each side. On the beard —- two on each side and one below. R' Eliezer says: If he removed it all at once, he is liable only once. He is not liable unless he removes it with a razor. R' Eliezer says: Even if he plucked it with a tweezer or with a plane, he is liable.