Rat ?, yep, you stomp on them
House cat ?, Possibly, Though i think you’ve be really clawed to bits.
Goose ?. Easy. grab neck, twist and pull(Its the same with all dispatching of birds of the food kind.
Medium size dog ?. Maybe able to strangle it to death.
Chimp ?. Might get a lucky kick to the head, but if you miss you’re done for.
Cobra.? Again a possible if you can get the tail end without being bitten, then it i suspect a case of whirl it around your head while looking for a tree to bash it into.
Kangaroo ?. Possibly not.
Crocodile ?. How the hell do you even kill one of them with anything other than a gun.
Gorilla ?.. Not a chance.
Lion ?. 12 hours later you become lion poo.
Elephant ?. This is getting ridiculous
Grizzly bear ?. Play dead and hope if doesn’t decide to f*** you and if it does try to fake an orgasm.