The Kangaroo! are you really asking that?!?!
The Bowhead whale is the longest living mammal.
Narwhal.
Whales.
snake
A Kangaroo
A giraffe is the tallest mammal alive, it also has the longest neck!
A giraffe is the tallest mammal alive, it also has the longest neck!
a dolphin or whale
a camel
I'm not certain, but I'm pretty sure the Fin Whale, Balaenoptera Physalus, is the second longest mammal at about 88 feet long.
African elephants have the longest gestation periods, at around 22 months.
whales for 20 hours