Do caterpillars eat fruits

No. Butterfies will eat fruit, but caterpillars will not.

Cats eat the host plant that their eggs are laid on. Each type of butterfly has a different host plant. Monarchs lay their eggs on the Milkweed plant. The Red Admiral butterfly lays her eggs on Pellitory Weed, & False Nettle Weed. Swallowtails lay their eggs on Sweet Fennel, Alfalfa, & Clovers.

I have many pics from my butterfly garden of butterflies & a few of Monarch cats. The facebook page is Flowers in Bloom. There are several pages with that name, so look for the profile pic with the gray butterfly, that's my page.