The biomes were domed areas found on Star City designed to replicate Earth's wild biomes. In Star City's low gravity, oak trees which were usually thick trunked on Earth were very slender in the biomes and palm trees were like giant reeds. Orchids grew to enormous sizes as well.
The biomes were not tended by robots due to the designers 'carbon chavinism'. Instead dinosaurs were used. Probably cloned from DNA preserved in amber, dinosaurs, including raptors, were put to work in the biomes. They had manual dexterity and being carnivores and patience developed from the stalking of prey. The apes and monkeys once used in the biomes did not have enough patience, being mostly herbivores.