The holder of a
standard licence, or a relevant person for the holder, must keep a live
animal, bought or accepted under the licence, for at least 6 months (the
"retention period" ) after receiving the animal unless—
(a) the holder has written approval from the chief executive to sell or give away the animal within the retention period; or
(b) the animal dies or escapes; or
(c) if the animal is a bird—the bird was bought or accepted for rearing and fledges within the retention period.