(14 + "floaters"), which may add another 8–10 individuals to the total ecological density/km2. The average day range calculated by Kinzey (1977) and Kinzey et al. (1977) was 819.4 m (n=22 days) for a research project in Peru and at the Estación Biológica Caparú the average was 807.2 m (range 513.7 – 1070 m, n=26). Easley calculated a time budget based on 400 hours of observation as 62.7% rest, 16.5% moving, 16.1% feeding, 2.7% grooming, 1.6% playing and 0.3% vocalizing. Palacios & Rodríguez calculated 54.3% rest, 22.9% moving, 17.6% feeding, 4.07% grooming, 0.41% playing, and 0.42% vocalizing based on 240 hours of observation. Easley analyzed the locomotive and positional behavior of the species showing that it is a generalized quadruped using quadrupedal walking and running about 66.8% of the time. This species also engages in active jumping (23.9% of the time) and climbing 9.1% of the time). Sitting (62%3% is the most common posture, followed by lying (16.1%), walking (10.4%), jumping (4%), vertical clinging (3.1%), climbing (1.5%), running (0.8%), hanging suspended by the back legs (0.8%), horizontal clinging (0.7%) and standing 0.2%). If postures of locomotor behaviors are excluded from this analysis then the scores were sitting (74.8%), lying (19.3%), vertical clinging (3.7%), hanging suspended from the hind foot (0.9%), horizontal clinging (0.8%) and standing (0.2%). Previously Kinzey & Rosenberger had pointed out that these animals fit into the "clinging and leaping" group of primates. Groups of collared titis sleep on top of large branches of emergent trees, frequently a bit above the level of the main canopy. Diet Although fruits are the major portion of this primate's diet, invertebrates and leaves are also consumed to a smaller degree. Lepidopteran larva, spiders and orthopterans are especially eaten with relish and probably occasional small lizards, judging by the hunting preferences of a tame, free-ranging adult female, which lived at the Caparú Biological Research Station on the lower Apaporis River. Kinzey found the following range of dietary preference during his 135 hours study in Peru: 14% Clarisia racemosa (Moraceae); 13% unidentified (Guttifereae); 7% Pithecellobium sp. (Convolvulaceae); Jessenia bataua (Arecaceae); Psychotrian axillaris (Rubiaceae); Guatteria elata (Annonaceae); Virola sp. (Myristicaceae). Easley identified frequency of item choice in the diet of the same groups as above: 74.1% fruits, 15.8% insects, 8.8% leaves, 0.6% buds and flowers and 0.1% other. Of the 57 fruit species identified, the palm tree, Jessenia polycarpa, was the most commonly eaten