Atrato River
In general, the aquatic fauna shows connections with the Magdalena–Cauca River basin, but also the Atrato River basin. There has been extensive habitat destruction in the region, causing problems to many species in the area. Two parrots that are endemic to the river valley, the Sinú brown-throated parakeet ("Aratinga pertinax griseipecta") and the Sinú parakeet ("Pyrrhura picta subandina"), have not been recorded for decades and are feared extinct.