sea creatures US National Park Service: What are these weird creatures that washed up on the beach? David Pescovitz

sexual dimorphism Watch this mesmerizing underwater video of a beautiful blanket octopus Thom Dunn

sea creatures Watch smart dolphins build a jail from mud to trap fish for dinner David Pescovitz

Apolemia Giant string-like creature composed of "millions of interconnected clones" found off the coast of Australia Thom Dunn

sea creatures New footage of a bizarre sea creature that's likely the longest animal in the oceans David Pescovitz

sea creatures "Cthulhu was real!" say scientists David Pescovitz