Flemish Giant Rabbit🐇 The Largest Rabbit Breed in the World | All About Animals The Flemish Giant rabbit is a large, domesticated breed known for its gentle temperament and impressive size. Adults weigh 15–22 pounds or more and can reach 2.5–3 feet in length. They have a muscular build, long upright ears, and a glossy coat in various colors. With a lifespan of 5–8 years, they are friendly, social, and intelligent, making them great pets. Flemish Giants require ample space, a diet rich in hay, v