GREGORY DIMIJIAN / SCIENCE PHOTO LIBRARY GREGORY DIMIJIAN / SCIENCE PHOTO LIBRARY
Wild cuyaba dwarf frog (Physaelaemus nattereri), 4 cm long from snout to vent, calling at night with lungs inflated in flooded grassy depression after a heavy rain, in Pantanal of Mato Grosso, Brazil. Call is a descending hoo-o-o perfectly synchronized with other individuals on all sides.
Model release not required. Property release not required.