Solvin Zankl / Brown hyena (Hyaena brunnea) urinating, Sperrgebiet National Park, Namibia, December.

Solvin Zankl / Droppings and urine of brown hyena Hyaena brunnea), Sperrgebiet National Park, Namibia, November.

Jussi Murtosaari / Oystercatcher (Haematopus ostralegus) excreting, southern Finland, April.

Roger Powell / Curlew Sandpiper (Calidris ferruginea) in full breeding plumage, excreting salt water by 'sneezing' it from its beak after feeding. Varanger shoreline, Finmark, Norway, June.

Michel Poinsignon / Peregrine falcon (Falco peregrinus) female excreting, Lorraine, France, May

Nick Upton / Sequence 3 / 4. Cleg fly / Horsefly (Haematopa pluvialis) excreting excess water as it swells up with blood sucked from photographer's arm, Wiltshire pastureland, UK, June.

James Christensen / Fulgorid Planthopper (Pterodictya reticularis) pair feeding on sap, showing plumes of excreted white wax, Colon, Panama

James Christensen / Fulgorid Planthopper (Pterodictya reticularis) feeding on sap, showing plumes of excreted white wax, Colon, Panama

Jane Burton / British show pony newborn foal passing its first urine, UK, sequence 24/26

Jane Burton / British show pony newborn foal passing its first urine, UK, sequence 25/26

Nature Production / Seven-spotted Ladybird {Coccinella septempunctata} feigning death and excreting stinking liquid from leg joints for self-defense,

Nature Production / Japanese Waxwing {Bombycilla japonica} excreting parasite's seeds, Japan