Monkey mandrill, almost long and weighing up to . Some are arboreal (living in trees) while others live on the savanna; diets differ among the various species but may contain any of the following: fruit, leaves, seeds, nuts, flowers, eggs and small animals (including insects and spiders). Some characteristics are shared among the groups; most New World monkeys have prehensile tails while Old World monkeys have non-prehensile tails or no visible tail at all. Old World monkeys have trichromatic color vision like that of humans, while New World monkeys may be trichromatic, dichromatic, or—as in the owl monkeys and greater galagos—monochromatic.
Mars habitat addition to the reactants. Mars habitat A Mars habitat is a place that humans can live in on Mars. Mars habitats must contend with surface conditions that include almost no oxygen in the air, extreme cold, low pressure, and high radiation. Alternatively, the habitat may be placed underground, which helps solve some problems but creates new difficulties. One challenge is the extreme cost of building materials for Mars, which by the 2010s was estimated be about $2 million USD per brick to the surface of Mars. While the gravity on Mars is lower than that on Earth, there is increased