Which animals can hold their breath underwater the longest? The ocean sunfish ( Mola mola ) was found to have as many as 300 million eggs in its ovaries at one time.

Family ties are the key to survival—not just for the babies, but also for the species. With so much at stake, many adult animals muster their fiercest behavior to defend their young.

The animal kingdom mirrors our own in many ways, like how animals care for their young. Just as humans hire babysitters or rely on grandparents and friends to watch their kids, animals also care ...