In Bracken Cave, TX, Batman would be seriously outnumbered. But can this swarm of millions of bats drive off the attack of a determined hunter, the hawk?
They emerge at dusk, first a few...then thousands...then millions.
It may look like the set of a horror film-but the mouth of Bracken Cave in east Texas is the staging ground for the largest swarm of mammals on the planet.
Here, Batman would be seriously outnumbered.
From March to October, as many as 20 million bats roost, feed and breed here.
They may be only a few inches long, but with this many neighbors, real estate is at a premium.
But these bats don't mind crowds.
The more the bats hang together, the harder it is to pick out individual bats as prey.
Their sheer numbers can be overwhelming, and their quick changes in direction can be confounding to potential predators.
Now that's mob rule.