The ProAves El Paujil Reserve, located in the Serranía de las Quinchas, in the municipalities of Puerto Boyacá, Bolívar and Cimitarra in the departments of Boyacá and Santander, was created to guarantee the preservation of one of the most vulnerable ecosystems in the Magdalena Medio valley, the tropical humid forest. Nearly 360 bird species have been registered in this place, of which 8 are endemic, 8 almost endemic and 4 are threatened, such as the Blue-billed Paujil (Crax alberti), an endemic species from Colombia and critically endangered. Likewise, in the constant monitoring carried out by the Foundation rangers in the ProAves El Paujil Reserve, populations of Spider Monkeys (Ateles hybridus), a critically threatened species, have recently been observed, moving in groups of between 16 and 20 individuals, made up of 8 females and 4 males and infants.
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