A Big-headed Rain Frog of the Western Amazon forest floor. Photo from eastern Ecuador. There is some confusion as to whether this should be filed in the Craugastoridae or Strabomantidae family.
From Amphibiaweb: This species is relatively uncommon, but widely distributed, and regularly seen in Costa Rica. The population at La Selva, Costa Rica appears to have experienced a decline (Whitfield et al., 2007). General habitat loss by the destruction of natural forests is a threat to this species. At La Selva, declines seem to be driven by climate-driven reductions in quantity of standing leaf litter (Whitfield et al., 2007). -- photographed at La Selva Biological Station, Costa Rica