David Kjaer / Juvenile European cuckoo {Cuculus canorus} begging for food from 'parent' Reed warbler {Acrocephalus scirpaceus} UK

Adrian Davies / Cauliflower Fungus (Sparassis crispa) parastic on Pine tree, UK

David Kjaer / Arctic / Parastic skua in flight pale phase Scotland {Stercorarius parasticus}

John Waters / Close-up of Broomrape (probably Orobanche minor) flowering spike, a parastic plant, in woodland near Bristol, UK, April.