re: #81 Gus
This story appears to have the “scientists” concerned: U.S. Government Plans To Air Drop Toxic Mice To Fight Snake Invasion The “poison” is Acetaminophen. I haven’t been able to confirm the parachute drop stuff.
No parachutes likely—mice are pre-deaded. (Suspect that mice have such a low terminal velocity that most would make it if dropped alive. Teaching them to do a good parachute landing fall would be a bitch, though.)