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infants. A nest box is required by all. The slow-moving lorises, as opposed to the more active galagos, require multiple horizontal branches and platforms for resting and marking. Because lorisines have a "dropping response" when startled (i.e., they fall to the floor), floors should be well cushioned with shavings or other suitable material.
Tarsiers are active jumpers, and a male and female will need an enclosure about 2 x 2 m (6.6 x 6.6 ft) and 3 m (9.8 ft) high to allow for leaping. In larger enclosures, they can be kept in groups. Rooms or cages should be furnished with multiple vertical bamboo poles, tree branches, and vines. Tarsiers will not use a nest box but do like to sit in tangles of vines. The substrate of cage furniture needs to provide ample climbing surfaces so that insects and lizards, introduced as food items, can be seen and hunted. High humidity is required by tarsiers; if it is not supplied through circulating air, the animals should be misted several times a day. Tarsiers prefer to drink droplets from the misting on their fur and cage furniture, rather than to drink from dishes. To prevent injury, cage floors should be covered with litter 5 cm (2 in) deep, such as shredded cypress bark, which is resistant to decomposition and retains moisture.
Inasmuch as the prosimians are a highly diversified group of animals with extraordinary variation in dietary requirements, no general diet can be recommended. The group as a whole will not thrive on commercial diets standardized to meet the needs of New World or Old World monkeys. Many of their dietary needs are still not well understood. Therefore, maximizing dietary variety might prevent nutritional imbalance. The recommendations that follow are essentially descriptions of the most successful diets known at this time.
The true lemurs can be maintained on a diet of monkey chow mixed with alternating selections of chopped fruits and vegetables. The gentle lemur (Hapalemur) eats the leaves and stems of several bamboo species and seems to prefer only particular vegetables, such as cucumber and sweet potato. It appears to extract nutrients more efficiently than other lemurs, and browse should be carefully screened for potential toxicants (e.g., oxalates in Russian vine). The ruffed lemur (Varecia ) is much more frugivorous and has a very short gut-passage time. Soft stools in these animals are firmed by the addition of browse to the diet. For the gentle lemur and mongoose lemur (Eulemur mongoz ), monkey chow should be restricted lest they tend to become obese and develop hypercalcemia.
Mouse and dwarf lemurs (Cheirogaleidae) can be fed a combination of cracked monkey chow mixed with chopped fruit and vegetables and live crickets or mealworms. For the fat-tailed dwarf lemur (Cheirogaleus medius), the daily