Large spiders, like the Wolf Spider, carry their babies on their backs to ensure survival.

The undisputed heavyweight champion. They can reach 9 feet tall and run up to 43 mph .

The largest spider by mass. It can have a leg span of 12 inches —roughly the size of a large pizza.

What do these giants have in common with "Mom"? In the animal kingdom, size often correlates with fierce maternal instincts.

When we think of large birds, we look beyond the common pigeon to creatures that dominate the ground and the air.

The winner for leg span. They are incredibly fast and can reach up to 1 foot across .