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.
Catch it and put it in truck
Echo Location really is the answer
To hear things.
Your ears.
They use it to walk of course, to scratch behind there ears and all the things dogs use it for.
Most bats catch prey using their ears through a process called echolocation. They send out a high pitch (high frequency sound) which is above the human hearing range, and this sound echos off of their surroundings. Their ears are designed to catch this echo, and then they process the echos to get a sort of "mental image" of their surroundings. See Related Links for more info.
a net
Bats. They are blind and rely on their ears to see. They make a slight chatter noise that they use as sonar waves. When the sound waves bounce back to the bat's ears, it allows them to tell where they are or where things are.
echo location tells them where things are.
Caterpillars do not have ears, but they use their eyes to get around when they sense things.
You could use "marsupial" but that applies to other animals as well. To refer to something as "of or like" a kangaroo, you would use the word kangaroo as an adjunct noun (kangaroo fur) or possessive (kangaroo's pouch).
we use colours to catch peoples eyes and make things look pretty basically, we can also use colour to catogarise things!