The snorkelcrest replaced its ancestor the marsh dweller. Its crest has evolved into a hollow chamber in which it can store air when sticking its head in the water to eat the aquatic flora. Its hanging sail membrane has also become sensitive to sound. They can "hear" the vibrations of sound and can make out loud noises. This is useful since their ancestors were deaf and had to rely on sight only. Their crests can make honks and hoots which are loud enough to communicate which each others poor hearing.
They still can change their head and neck colors to communicate. Their eyes have protective eye lids which they close when sticking their head in the water. Thus they cannot communicate when fully submerged. Different colors mean different feelings, such as red being aggressive. Their back feet no longer walk on their knuckles. Their tail has returned to its ancestral position as the 3rd leg. This helps them stay stable when they lift up their front legs to slice off branches with their short spade hands.
They are docile creatures who live among the river chut. Herds are usually 5 to 8 members plus the river chut herd. This tends to discourage any predator that would want to prey on them. They give birth 1-2 offspring every 2 years. And lay their eggs on the river banks in sandy nests. Mothers will sit on the nests until that hatch while the fathers will bring food to the mother. Once they hatch the mother will take over bring them food until their are big enough to join the rest of the herd. They have an average lifespan of 30 years.