European hare adaptions for high speed running in hares include wider nostrils and larger hearts. In comparison to the European rabbit, the hare has a proportionally smaller stomach and caecum. This hare is one of the largest of the lagomorphs. Its head and body length can range from with a tail length of . The body mass is typically between . The hare's elongated ears range from from the notch to tip. It also has long hind feet that have a length of between . The skull has nasal bones that are short, but broad and heavy. The supraorbital ridge has well-developed
Mad as a Mars Hare had the gun in reverse, so Bugs is reverted into a huge and muscular Neanderthal rabbit, who immediately grabs Marvin and crushes him with just one hand; Marvin goes off to be regenerated again, while saying: "Well, back to the old electronic brain!" (a possible reference to "Hare-Way to the Stars"). Bugs then breaks the fourth wall while speaking to the audience about how when he gets back to Earth old Elmer Fudd and the rest of the hunters are due for a "big surprise" before eating the metal carrot. ""Mad as a Mars Hare"" is available on the "Bugs