In the United States, there are 15 puppies and 45 kittens born for every one human. The largest squid on record weighed more than a ton and was over 50 feet long. Its eyes were the size of basketballs. The adorable platypus has spines on its back feet that release venom strong enough to cause swelling and inflammation in humans. Specially trained "cancer sniffing" dogs can smell the metabolic waste produced by active cancer cells. If there are no suitable male turkeys around, a female turkey will fertilize her own eggs. The grizzly bear's jaw strength is 1,200 pounds per square inch, which is enough to break a bowling ball.