This looks like the same Gulf Fritillary butterflies we get up in North America! They range down into South America, too!
The caterpillars eat leaves from the passionvine. There are lots of varieties of this plant. Here are two in Texas:
Yellow Passionflower
Passiflora “incense” - I grow this vine in my garden and it takes over the entire back yard! The flowers are huge (see the spider in the right of the photo?) and hummingbirds will even come to feed at them.
