A large male Black Ctenosaur (Iguana negra) with parasitic ticks, a lizard species endemic to Central and South America, Nosara, Nicoya Peninsula, Guanacaste Province, Costa Rica, Central America

Three species of barnacles, Coronula diadema, Cryptolepas rhachianecti, Conchoderma testudini

Batfish (Species unknown) with fish louse. Wakatobi, Onemobaa Island, Indonesia Restricted resolution (Please contact us). (RR)

A bush cricket on a Rosmary plant. The atrophied wings of Ephippiger species are unfit to flight and only used for the emission of sounds. This one has some parasitic mites on it

A Slender Spongegoby (Phyllogobius platycephalops) and two different species of crabs. Attached to the goby are several parasites with egg cases, that will likely prove fatal over time. Many species live on the convuluted surface of this sponge, Philippin

These two parasitic mollusks, Thyca crystallina, are growing on the host starfish, Linckia laevigata. This parasitic shell only attaches to this species of starfish, into which it burrows and sucks up nutrients, Philippines

Cuckoo perched in a blooming tree at spring, GB

Dead fan mussel and diver, Mediterranean Sea. Massive mortality of Noble Pen Shell (Pinna nobilis) infected with the parasite Haplosporidium. Porticcio. Corsica. Mediterranean.

Rock grayling (Hipparchia semele) Imago posed in the moor with a red tick on the thorax mimicry of colors, Landes rases Cap d'Erquy, Natural site of the departmental council of Côtes d'Armor, Brittany, France

Cuckoo perched on a fence at spring, GB