I'm having the same problems. Still need the three species and two creatures. I've even killed some of the animals, still no luck. Also, how are you supposed to meet the two bounty hunters to get the codex as a trooper?
EDIT: went back and checked. specifically what I am missing is:
Bestiary - Gapillian Grazer, Razoronn
Species - Kel Dor, Mon Cal, Rodian