Butterflies and crocodiles

 Butterflies drink the tears of caiman crocodiles in the Amazon basin.

                       Why feed on tears?A number of insect species including moths,butterflies and bees are known to tear-feed,usually on mammals and in some cases even humans

                       Tear-feeding on reptiles is less well documented,but in every case the insect seems to be in the pursuit of nutrients and minerals-chiefly salt.

                        '' Sodium and some of these other micronutrients are hard to find in nature'',said de la Rosa.Butterflies and bees consume nectar,and nectar does not have a lot of salt.But they still need salt for egg production and for their metabolism.''-     National Geographic