general: Birds are insect controllers
general: Sloths take a lot of time to eat
general: Butterflies are insects
specific: A 3-ounce baby bird will eat 5 ½ ounces of insects. Birds eat almost twice their own weight.
specific: Sloths stomachs are multi-chambered, similar to a cow's stomach, and house a mix of bacteria which helps to slowly break down the leaves.
specific: Butterflies have taste sensors on their feet, and by standing on a leaf, they can taste it to see if their caterpillars can eat it.
hope this helps!