Why did the captain drown the parrot in the jade theft case?

Jade was stolen because the parrot bit the captain before it was stolen. An old gypsy woman looked at Captain Haddock's palm and predicted that trouble would happen. In fact, before the trouble came, Tintin, Milu and the captain all had a rare leisure time at home. While Casta Phil came uninvited, Casta Phil came to send a captain a parrot, and the parrot bit the captain, which aroused strong media attention. But at the same time, Casta Fei's emerald disappeared. Tintin tried his best to find out about it, and finally found a strange and innocent thief, thus clearing the suspicion of gypsies.