What in South America Makes its spiders so huge?

Question

Seeing lists of the biggest spiders in the world, the vast majority of them seem native to South America, especially Brazil. Is there anything special in that region that contributes to spider gigantism?

In: 16

Answer 1

Easiest answer to reach for is evolution. Spiders evolved that way as those genetics were preferred among those species. So those traits became dominant. Simple as that.