The Stalker, a raptor like predatory creature, that likes to sit in the tall grass and picks at passers by. I scouted a lot of animal sounds for the vocals and divided them into categories in my session, such as hisses, articulation, moans and so forth. Each vocal had a combination of the categories. As for AI you need to support call states of that entity. The usual states would be pain, getting hit and death. Also states like, intruder spotted and so forth. A fun creature to design.
The Scorcher is a bug like unit. I did not spend much time on it, since there were not that many states to support. Nevertheless, it was also fun to create audio for.