They and we are both mammals, but bunnies are in the order Lagomorpha and we aren’t. Clarifying the relationships of the mammalian orders (pdf) will require more data. Unlike birds and lizards bunnies are synapsids. Recall that early amniotes split into synapsids and sauropsids (mammal like amniotes and reptile like amniotes). Clearly we mammals and the sauropsids are all craniates.
I’m posting this quick reminder because today is the day for it, and because some readers may enjoy the well done article on the subject by DarkSyde.