The Chaco ecological region consists of dry thorn forest and scrub subjected to pronounced seasonality in rainfall. Locally, wetlands, gallery forest, and enclaves of wooded grassland will also be found.

Recommended eBird Hotspots in the Chaco:
Boyuibe Side Road
Lomas de Arena
Santa Cruz Botanical Gardens

Bolivian Endemics and Near-Endemics:
Thamnophilus sticturus/Bolivian Slaty-Antshrike

Threatened species:
Crax fasciolata/Bare-faced Curassow
Buteogallus coronatus
/Chaco or Crowned Solitary Eagle

Other ecoregion specialties:
Nothoprocta cinerascens/Brushland Tinamou
Eudromia formosa
/Quebracho Crested-Tinamou
Aramides ypecaha
/Giant Wood-Rail
Strix chacoensis
/Chaco Owl
Dryocopus schulzii
/Black-bodied Woodpecker
Chunga burmeisteri
/Black-legged Seriema
Spiziapteryx circumcincta
/Spot-winged Falconet
Rhinocrypta lanceolata
/Crested Gallito
Drymornis bridgesii
/Scimitar-billed Woodcreeper
Tarphonomus certhioides
/Chaco Earthcreeper
Furnarius cristatus
/Crested Hornero
Phacellodomus sibilatrix
/Little Thornbird
Coryphistera alaudina
/Lark-like Brushrunner
Asthenes baeri
/Short-billed Canastero
Pseudoseisura lophotes
/Brown Cacholote
Saltatricula multicolor
/Many-colored Chaco-Finch
Lophospingus pusillus
/Black-crested Finch
Rhynchospiza strigiceps
/Stripe-capped Sparrow