Doc White / Humpback Whale (Megaptera novaeangliae) calf, underside view, genital slit visible, Tonga, South Pacific, September.

Roland Seitre / Brazilian Tapir (Tapirus terrestris) genital area with parasitic tics. Captive. Medellin Zoo, Antioquia, Colombia.

Florian Möllers / Female Chimpanzee (Pan troglodytes schweinfurthii) "Lola" (18 years) with large genital swelling feeding on juvenile Red-Tail Monkey (Cercopithecus ascanius) in a tree. Budongo Forest Reserve, Masindi...

Florian Möllers / Female Chimpanzee (Pan troglodytes schweinfurthii) "Lola" (18 years) with large genital swelling feeding on juvenile Red-Tail Monkey (Cercopithecus ascanius) in a tree. Budongo Forest Reserve, Masindi...

Florian Möllers / Female Chimpanzee (Pan troglodytes schweinfurthii) "Lola" (18 years) sitting in rainforest tree, large genital swelling. Budongo Forest Reserve, Masindi, Uganda, Africa. December

Florian Möllers / Female Chimpanzee (Pan troglodytes schweinfurthii) "Juliet" (16 years) with large genital swelling, calling. Budongo Forest Reserve, Masindi, Uganda, Africa. December

Doug Perrine / Close up of throat pleats, navel, genital and anal openings, and mammary slit of Bryde's whale (Balaenoptera brydei /edeni) as it passes photographer as it charges through a small school of Sardines,...

Fabio Liverani / Purple crocus (Crocus angustifolius), Emilia Romagna Region, Italy

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) genital slit, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987