Population of Dolphins

According to the experts dolphins population is dificult to estimate since there are many different species spanning a large geographic area. The International Society for the Preservation of the Rainforest (2004) says that these friendly mammals actually have a brain size 40% larger than we do! And another unique characteristic is that they can turn their heads 180 degrees because of unique fused vertebrae in their neck, and suggests capillaries near the skin may be due to its color