Pinnipeds, which we commonly call as seals are semi-aquatic mammals which live along the coasts.  These mammals vary in size as the smallest is the Baikal seal found in Lake Baikal in Russia which is around 110 pounds whereas the biggest being the male elephant seal of the coast of California which weighs around 8150 pounds.  These naughty sea mammals love to open their mouth wide open and laugh out loud.  But for the fact that whether the seal really laughs, there is no evidence as such.  The e...