Now this is awesome. Just when we thought we knew everything out come surprises. A group of British and Brazilian researchers have found out that South American river dolphin (Inia geoffrensis) uses branches, weeds and lumps of clay to woo the opposite sex and frighten off rivals. They would slowly come up above the surface of water in a vertical posture holding this stuff in their mouths. Details appear in the journal Biology Letters.
The Amazon River dolphin can be found in the Amazon River system as well as the Orinoco River system flowing throughout South America, mainly in the countries of Brazil, Bolivia, Ecuador, Venezuela, Colombia, Guyana and Peru. Adults grow to 2.5 metres and weigh 150 kilos. The dolphin eats crabs, shrimps, and sometimes even turtles and catfish.