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A pair of vibrant nudibranchs, Nembrotha kubaryana, mate on a coral reef in the remote, tropical islands of Raja Ampat, Indonesia.

Adult male pink salmon (Oncorhynchus gorbuscha - nicknamed the "Humpbacked salmon") struggling to swim upstream to spawn in a stream in southeast Alaska, USA.

Adult male and female pink salmon (Oncorhynchus gorbuscha - nicknamed the "Humpbacked salmon") spawning in a stream in southeast Alaska, USA.

Adult male and female pink salmon (Oncorhynchus gorbuscha - nicknamed the "Humpbacked salmon") spawning in a stream in southeast Alaska, USA.

Adult male and female pink salmon (Oncorhynchus gorbuscha - nicknamed the "Humpbacked salmon") spawning in a stream in southeast Alaska, USA.

Adult male pink salmon (Oncorhynchus gorbuscha - nicknamed the "Humpbacked salmon") spawning in a stream in southeast Alaska, USA.

Close up of a mother of thousands leaf, Bryophyllum daigremontianum, reproducing asexually., Arlington, Massachusetts.

A spotted hyena male, Crocuta crocuta, mounts a female while mating, looking away, backlit, Londolozi Game Reserve, Sabi Sands, Greater Kruger National Park, South Africa

A mating pair of leopards, Panthera padrus, snarl at each other, Sabi Sands, Greater Kruger National Park, South Africa

Thick-billed Murres, Brunnich's Guillemots, nesting on a steep cliff site, near Svalbard in Norway, Svalbard, Norway