On a “misty mountain” in Sri Lanka, a 2-foot-long creature moved quickly through the trees and came to rest on a branch. Its coloring largely helped it blend in — until something nearby spooked it.

Silvery-blue with dark bands, one of the world’s most venomous snakes, found in the Indian Ocean and Southeast Asia. Glossy olive or purple-brown, aggressive when provoked, found in coral reefs around ...

Hordes of bright blue, jellyfish-like sea creatures are washing up on beaches across California. As of Monday, thousands of the critters — called velella velella or by-the-wind sailors — have ...