This video says about itself:
A Julia butterfly (Dryas iulia) and a solitary bee (Centris sp.) sip tears from the eyes of a spectacled caiman (Caiman crocodilus) on Costa Rica‘s Puerto Viejo River. Filmed by ecologist Carlos de la Rosa, Director of the La Selva Biological Research Station, in December 2013.
Carlos L de la Rosa (2014): Additional observations of lachryphagous butterflies and bees. Frontiers in Ecology and the Environment 12(4): 210.
See also here.