Thomas Marent / Velvet-purple Coronet (Boissonneaua jardini) hummingbird in defensive posture, Las Tangaras Bird Reserve, Colombia

Ron Bielefeld/ BIA / Black-bellied Whistling Duck (Dendrocygna autumnalis) flying, Florida

Eric Sohn Joo Tan/ BIA / Black-winged Lapwing (Vanellus melanopterus) calling during defensive display, KwaZulu-Natal, South Africa

Marion Vollborn/ BIA / Tiger (Panthera tigris) female with cubs, native to Asia

Alain Ghignone/ BIA / Eurasian Wryneck (Jynx torquilla) calling, Aosta Valley, Italy

Suzi Eszterhas / Sea Otter (Enhydra lutris) orphaned pup, three weeks old, Alaska SeaLife Center, Seward, Alaska

James Dunbar / Leaf cutter ants (Atta sp.) communicating. Guadeloupe National Park, Guadeloupe, Leeward Islands.

Alan Murphy/ BIA / Marsh Wren (Cistothorus palustris) calling, British Columbia, Canada

Alan Murphy/ BIA / Hepatic Tanager (Piranga flava) male calling, Arizona

Alan Murphy/ BIA / Golden-fronted Woodpecker (Melanerpes aurifrons) male calling, Texas

Alan Murphy/ BIA / Grasshopper Sparrow (Ammodramus savannarum) male calling, Arizona

Alan Murphy/ BIA / Cactus Wren (Campylorhynchus brunneicapillus) calling from cactus, California