Jungle bird, jaguar, and salmander heads

Game mode: Online
Problem: bug
Region: swamp
jungle birds, salamanders, and jaguars dont drop heads

Steps on how to reproduce issue:
1.try cuting heads with cleaver and hatchet nothing works

I haven’t had issues with the salamander or jaguar heads even using a regular hatchet does the job but I haven’t had one jungle bird head and haven’t even seen anyone have a jungle bird head trophy for that matter.

I’m wondering if they even exist.