The Cajas National Park is home to a large variety of animals, some of which are endemic or highly endangered. Among the most prominent are the South American condor, of which only 80 remain throughout all Ecuador; the curiquinga, a large black and white raptor, and the largest hummingbird of the world, the giant hummingbird ("Patagona gigas"), which lives only on agave flowers. The violet-throated metaltail ("Metalura gorjivioleta") is endemic to Cajas and surrounding valleys. The avifauna consists of 157 bird species, making birdwatching an alluring activity for visitors.