The plants and animals of the Miocene were fairly modern, but familiar present-day species had not yet evolve. Modern families of mammals and birds existed. Whales, seals, and kelp spread. Modern sharks appeared, including the huge "Megalodon". Grasslands became more common. Mammalian browsers became less common, and grazer species became more common. About 100 species of ape lived at that time, and cetaceans were very common in the seas. The giganic shark "Carcharodon megalodon" may have preyed on them.