Clockwork App Chat

Euryale: On small creatures, this infection leaves the host intact and just creates an extra mouth that screams when the host is nervous, so as to attempt to get eaten by a larger creature. When it infects a large creature, it will keep the outside in tact but when it finds a group of prey or is attacked snakes will burst out of it to kill you.

Since it saves the snake trick for groups, a lone hunter can relatively safely trap the big guys. And you can prevent sentient infections by telling people not to eat things that have mouths where they shouldn't have.