John Chan / Elegant terns (Thalasseus elegans) gathering at breeding grounds take flight in unison, an example of flocking behavior, Bolsa Chica Ecological Reserve, Southern California, USA, March.
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John Chan / Double-crested cormorants (Phalacrocorax auritus) and Snowy egrets (Egretta thula) gathering at evening roost site, Bolsa Chica Ecological Reserve, Southern California, USA, January.
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Magnus Lundgren / Wild Wonders of China / Bigfin reef squid (Sepioteuthis lessoniana) group gathering under garbage for protection during the day. LongDong, Taiwan, Pacific Ocean.
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David Perpinan / Cattle egrets (Bubulcus ibis) gathering at roosting site for the night, Barcelona, Spain, December.
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Doug Perrine / Magnificent frigate bird (Fregata magnificens) flock and Pink-footed shearwater (Ardenna creatopus) gathering around Olive ridley turtle (Lepidochelys olivacea) to feed on Bait fish hiding under it. P...
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Nick Hawkins / Sea run Brook trout (Salvelinus fontinalis) gathering to spawn, St. Mary's river, Nova Scotia, Canada. October.
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Nick Hawkins / Brook trout (Salvelinus fontinalis) gathering to spawn, St. Mary's river, Nova Scotia, Canada. October.
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Nick Hawkins / Brook trout (Salvelinus fontinalis) gathering to spawn, St. Mary's river, Nova Scotia, Canada. October.
