Aside from the sheer number of species, what really makes the area exceptional for birding is its large range of habitats and intriguing patterns of geographic variation. There are currently four confirmed endemic bird species in the Sierra de Perja, the Perijá Metaltail, Perijá Thistletail, Perijá Sierrafinch and the Perijá Tapaculo which became known to science in 2015 according to the Northern Colombia Birding Trail, an initiative supported by the Audubon society, in their latest report.  

This number is expected to grow steadily as a number of fairly common species found in the area such as the Rufous Spinetail and the local version of Yellow-breasted Brushfinch are very likely to be identified as a new species endemic to Perija.   Other potential new endemic species include a unique looking form of Lacrimose Mountain-Tanager which is quite common in the higher areas, and another potential endemic species is the local form of the Golden-bellied Starfrontlet.  

According to the Rainforest Trust several other taxa endemic to the Perijá mountains are almost certainly separate biological and phylogenetic species.  For example the Rufous Antpitta Grallaria “rufula” saltuensi and the Oleagineous Hemispingus Hemispingus “frontalis” flavidorsalis, to name but a few.  This makes it an incredibly exciting destination for birders with many new discoveries awaiting as birders and biologists increase their visits to the region, which until now has been one of the least visited of Colombia.