We do enjoy  watching the Musky Rat-kangaroos  (Hypsiprimnodon moschatus) in our garden, and sometimes we tease them with a very tempting morsel:

Musky Rat-kangaroos are mainly fruit-eaters (although they were quite keen on a dead White-tailed Rat, and one musky actually managed to drag the cadaver off into the forest), and they absolutely love avocado.

The seed is big and slippery, of course, so they cannot grab it with their teeth. No matter, from which side it tries to grab the seed, it just cannot get a hold of it: