Gary Bell/ Oceanwide / Australian Giant Cuttlefish (Sepia apama) group gathered for mating, Whyalla, South Australia, Australia

Marie Read / Baltimore oriole (Icterus galbula) male perched in pear (Pyrus sp.) blossom, eastern redbud in background, New York, USA. May.

Luciano Candisani / Green Anaconda (Eunectes murinus) female constricting male after copulation, after which she will consume him, Brazil

Steve Gettle / Great Egret (Ardea alba) in courtship display, North America

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) group migrating upstream, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Ingo Arndt / Sockeye Salmon (Oncorhynchus nerka) group swimming upstream during spawning run, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Donald M. Jones / Nashville Warbler (Oreothlypis ruficapilla) male calling in spring, western Montana

Winfried Wisniewski / Ruff (Philomachus pugnax) males displaying in rain at lek, Norway

Winfried Wisniewski / Ruff (Philomachus pugnax) male displaying at lek, Varanger Peninsula, Norway

Yva Momatiuk & John Eastcott / Sockeye Salmon (Oncorhynchus nerka) migrating upstream, Adams River, Roderick Haig-Brown Provincial Park, British Columbia, Canada

Tui De Roy / Takahe (Porphyrio hochstetteri) family in large breeding pen, Burwood Breeding Center, New Zealand

Sebastian Kennerknecht / Atlantic Puffin (Fratercula arctica) at nest burrow, Skomer Island National Nature Reserve, Skomer Island, Pembrokeshire, Wales, United Kingdom