Love That Pet offers the following on rabbit care"
"In addition to the many coat patterns, there are also several sizes to choose from. For example, dwarf lops and mini lops are very popular, and they are small: The mini doesn’t get bigger than 1.6kg (3.5lb), and the dwarf only gets to 2.5kg (5lb). These are the rabbits whose ears are very long and droop down to the ground. Many people, when they think of pet rabbits, are thinking of lops. By contrast, the Flemish giant is well-named. Often topping 6kg (14lbs), this rabbit is larger than most pet cats and many kinds of dog (up to and including some spaniels). Unlike the lops, Flemish giants have ears that stand upright. A little bigger than a dwarf lop and much smaller than a Flemish giant, the “rex” weighs in at approximately 3kg (6.5lb) and is noted for its curly fur.