Picture of the Day 07/01/26 - Wikimedia Commons

Willan's chromodoris (Chromodoris willani), Anilao, Philippines. This 5 centimetres (2.0 in)-long nudibranch can be found in the Western Pacific Ocean and feeds, like many other nudibranchs, on sponges.

Diego Delso, CC BY-SA 4.0, via Wikimedia Commons. View source.