...neuroscience? Are you implying that rabbits have the ability to understand the metaphysical concept of death like humans? If so where is your supporting evidence? Death is much more complex than simple things like language or long term planning and rabbits can barely do either.
Humanity is always seeking to define an arbitrary demarcation point between man and animal. The goal posts were moved (again) after we discovered orangutans using prepared tools to fish for termites.