How does a kangaroo use its ears to catch things?
The kangaroo does not use its ears to catch anything. To begin
with, the ears are not prehensile, and all they can do is rotate to
listen carefully for predators. Secondly, very few species of
kangaroos are anything but omnivores. No doubt the bettongs and
musky rat-kangaroos which are omnivores use their ears to carefully
listen for the movement of invertebrates, but that is completely
the extent to which any kangaroo will use its ears for catching
food.