A pajama nudibranch (Chromodoris quadricolor) attempts to climb up the side of a sea cucumber, Philippines, Southeast Asia, Asia

animal animal themes animals in the wild aquatic chordata chromodorididae chromodoris quadricolor close up color image coral triangle crawl crawling day dorid dorid nudibranch doridacea doridina doridoidea echinoderm echinodermata extreme close up fauna gastropod holothurian holothuroid holothuroidea horizontal invertebrate little macro marine biology mini mollusk nature no people nudibranch ocean life opisthobranch outdoors pajama nudibranch philippines photography rearing up rhinophore sea cucumber sea life sea slugs small southeast asia species standing on hind legs two animals undersea underwater wildlife zoology