1) Open polyself.c
2) Scroll down till you get to the monster anatomy
2a) More importantly, the stuff below it indicating how
anatomy names are distributed.
3) Observe that nothing has changed here since
4) Shake fist at ceiling while shouting "why?!"
Here's some hints to solving it:
Cockatrices and Pyrolisks are not birds. They have no
wings. But all the others should have bird parts.
Deep ones don't have hair, do they?
Many of the new quadrupeds have more horse parts
than animal parts.
Does Cthulhu resemble a kraken?
Bad Food. Literally food or just a variety of mimic?