White rabbits = Medical testing and experiments.

“Why rabbits? There is very little science behind the reason why rabbits are used. It has more to do with practical considerations—they are small and gentle and so easy to handle; they are relatively cheap to maintain if only basic standards are adhered to”

http://hsi.org/issues/becrueltyfree/facts/blinded_rabbits.html

The Rabbit is the international symbol for cruelty-free testing. Let that sink in.

https://www.crueltyfreekitty.com/cruelty-free-101/cruelty-free-bunny-logo/