A nudibranch shares a home in a bottle with a lemon goby, Anilao, Philippines.

acropora actinopterygii anilao animal animal den animal eyes animal head animal themes animals in the wild aquatic bottle citron goby close up color image extreme close up fish front view gobiidae gobiiformes goby hole horizontal lemon goby macro marine biology muck diving no people nudibranch ocean one animal outdoors perciformes philippines photography sea life small southeast asia tiny tropical fish undersea underwater vomerogobius flavus wildlife yellow yellow goby zoology