Most lizards have tails that will simply break off when frightened or threatened by a predator, and picking up a struggling lizard by the tail is one sure way to have it either drop it's tail or to have the tail break off.
(tails; will simply break off; T:when frightened or threatened by a predator) (Most lizards; picking up; a struggling lizard)
tails Most lizards
will simply break off picking up
T:when frightened or threatened by a predator
a struggling lizard