We're gonna need a bigger scale

You might think the biggest bundles of joy that arrive in the animal world belong to the largest animals. And while that's certainly true in some cases, it's not a universal rule. For example, the average kangaroo stands 5 to 7 feet tall and weighs about 200 pounds, but kangaroo babies, or joeys, are only 2 centimeters long and weigh less than a gram.

Many different types of bears have tiny babies, too. Newborn pandas weigh just 3 to 5 ounces and are 1/900th the size of the mother. And as the Washington Post reports, of the placental mammals, even giant pandas have the tiniest babies in comparison to the size of the mother.

So who are the proud parents of the heftiest newborn animals? Click through for eight of them. Cute as they are, these baby warthogs (pictured) don't make the cut.