. Coimbra Filho's titi has also been noted to exhibit extreme territorial and defensive behavior when threatened. Conservation Coimbra Filho's titi is currently considered endangered on the IUCN Redlist due to a variety of threats, both natural and anthropogenic, including habitat loss, habitat fragmentation, limited reproductive options, and increased predation. The primary biological threat to Coimbra Filho's titi comes from its mating behavior. While juvenile members of the species remain in their natal groups, upon sexual maturity they leave and set off upon their own. Coupled with the habitat fragmentation faced by the species, this behavior limits the number of sexually mature individuals in each fragment of the population, limiting reproductive options. The species' natural geographical distribution also contributes a threat to the species. Coimbra Filho's titi only naturally occurs in the Atlantic coastal forests in northeastern Brazil. This is a relatively small area in the states of Sergipe and Bahia. Due to this small range, any disturbances to these areas pose a larger than normal threat to the species' survival. More than anything else, however, human interference is the source of many problems to Coimbra Filho's titi. The areas around and inside its habitat are being developed, including paving roads and the promotion of tourism. Similarly, it is facing habitat loss due to increased logging in the area. Wooded areas inhabited by Coimbra Filho's Titi are also being rapidly converted into pastures for grazing and ranching. By the early 1900s, the coastal forests in Sergipe had been reduced to less than 40% of the size of their original cover. This trend continued throughout the 20th century, and these coastal forests now cover less than 1% of their original size. These activities are leading to increased habitat fragmentation. This fragmentation limits the size of breeding populations, limiting genetic diversity. This fragmentation also increases the risk of predation, as titis are forced to move from one fragment to another, exposing them to increased risk of predation. Coimbra Filho's titi was placed on Brazil's Official List of Threatened Fauna in 2003, managed by the Committee for the Conservation and Management of the Primates of the Northern Atlantic Forest and Caatinga. This organization is responsible for studying the current status and threats to the species, as well as developing and managing a plan for the species conservation. As of 2005, no attempts have been made at beginning a captive breeding program for the