Franco Banfi / Male Freshwater blenny (Salaria fluviatilis) resting in a crevice on lake bed, Lugano lake, Ticino, Switzerland.

Franco Banfi / Female Freshwater blenny (Salaria fluviatilis) portrait, Lugano lake, Ticino, Switzerland.

Martin Willis / Black-winged Monarch (Monarcha frater), Kutini-Payamu National Park, Queensland, Australia

Martin Willis / Black-winged Monarch (Monarcha frater), Kutini-Payamu National Park, Queensland, Australia

David Fleetham / Seastar shimp (Periclimenes soror) on a Crown-of-thorns starfish (Acanthaster planci), Yap, Micronesia.

David Fleetham / Commensal shrimp (Periclemenes soror) camouflaged on Cushion starfish (Culcita novaeguineae) Philippines.