The 5-7 ton weight range seems to be a limit for herbivorous dinosaurs and large mammals and is likely a metabolic limit due to eating low-cal forage.
Mammals
Mammary glands, which in females produce milk for nourishing (nursing) their young, a neocortex (a portion of the brain), fur or hair, and three middle ear bones are characteristics of mammals (from Latin mamma, "breast"). Mammals also have a neocortex and three middle ear bones. These traits set them apart from other reptiles, such as birds, from which they split off in the Carboniferous period, more than 300 million years ago. There are 29 orders and 6,400 known species of mammals that are alive today. The rodents, bats, and eulipotyphla are the three orders with the most species (hedgehogs, moles, shrews, and others). The following three are the Artiodactyla (cetaceans and even-toed ungulates), the Carnivora (cats, dogs, seals, and others), and the Primates (including humans, apes, monkeys, and others).
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