Animal Size Question

Question for any biology types out there:

What is the largest animal that has a population greater than man?

The Norway rat or Black rat species.

Next down, probably mosquitoes (widening range), then cockroaches, ants and termites.

What say the rest of you?

I’ve heard a certain kind of shrimp is much more numerous than man. That would out-large all of those insects, but not the rats.

According to one Web site I just checked, the Guinness Book of World Records in 1989 listed domestic chickens as having a world population of 6.5 billion. If they are still more numerous than humans, they would outrank rats.

Among other birds, the Red-billed Quelea, a small African finch, is sometimes listed as having a world population of 10 billion, but usually only 1.5 billion.

Mosquitos are bigger than cockroaches? Remind me never to go to your cookouts.