Can someone please explain this joke?

Question

It was in a joke book. This might not be exact.

--

There's a male zebra with thin strips and a female zebra with thick strips. They have a baby. What is the baby's name?

Arthur

Answer 1

That doesn't make any sense to me either.

Answer 2

Yeah....er......its....er....because....... .......male zebras dad was called arthur and they named it after him!

Honest i know them personally we're in the same basket weaving class

Answer 3

Female zebra with thick stripes... Arthur... art... hur... Art Her. I guess. Not funny anyway.