2. Killer Whale
If you’re a mother you will empathise with the lot of the mommy orca. One of the biggest complaints of being a new mom is lack of sleep. Move over sister, you’ve got no real beef! When an orca baby is born, it doesn’t sleep for the entire first month of its life. And not only does mommy orca have to stay awake too, but she has to keep swimming with the calf close by to build baby’s fat reserves and muscles and to avoid predators.