Ernie Janes / Pintail duck (Anus acuta) drake swimming on water with reflection, UK, March.

Chris O'Reilly / Mallard duck (Anus platyrhynchos) adult male in flight over the sea, RSPB Snettisham, Norfolk, UK, November

Tim Laman / Sea urchin (Echinoidea) detail, with anus visible, Malapascua Island. Visayan Sea, Philippines

Juergen Freund / Sea cucumber {Holothuroidea} showing Cuvieren tube system excreted from anus in defense, Indo-pacific

Doug Perrine / Leopard sea cucumber {Bohadschia argus} emitting sticky cuvierian tubules from anus as defense measure, Mabul Island, Borneo, Malaysia

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) researcher encouraging infant to eliminate, China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) researcher encouraging infant to eliminate, China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) researcher encouraging infant to eliminate, China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China

Juergen Freund / Pearlfish {Carapus sp} hiding in anus of sea cucumber Sula-Sulawesi seas, Indo-Pacific

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) newborn with part of umbilical cord still attached, held by worker at the China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China