Box jellies live in tropical mangrove swamps in Central America. Their polyps settle out on mangrove roots, and the adult jellies live sheltered in between the roots of the trees, probably avoiding predators.
Mangrove forests are among the most threatened ecosystems on our planet. They’re cleared for development, agriculture, and fish and shrimp farms. Pollution and sediment from land flow into these shallow coastal habitats, threatening the diverse marine life that lives there. Without this nurturing habitat, it’s unlikely this tiny jelly would survive.