It is the manatees at the River Safari next day that take the cake. Manatee Mania is a behind-the-scenes experience, where guests are allowed to feed the marine animal. Massive manatees swim around with red-tailed catfish, arapaimas, river otters and red-bellied piranhas. Our guide hands me a basket of leafy veggies. The sea cows swim towards me, resting their big faces on the ledge. They are vegetarians, I am told. But it is still a little unnerving to see their lumpy lips rotate independently with thorn-like whiskers, waiting for food. The guide places the leaves near their mouths and says, &ldquotheir lips work like hands, grabbing the food and pushing it inside&rdquo. I reach to touch the mammal&rsquos head, my other hand putting the veggies in its mouth, only to pull back when I feel whiskers prickle at my wrists.