They are distantly related to the ratites (order Struthioniformes), which includes the rheas, emus, and kiwis. Gray tinamou, Tinamus tao Solitary tinamou, Tinamus solitarius (near-threatened) Great tinamou, Tinamus major White-throated tinamou, Tinamus guttatus Cinereous tinamou, Crypturellus cinereus Little tinamou, Crypturellus soui Brown tinamou, Crypturellus obsoletus Undulated tinamou, Crypturellus undulatus Brazilian tinamou, Crypturellus strigulosus Gray-legged tinamou, Crypturellus duidae Red-legged tinamou, Crypturellus erythropus Yellow-legged tinamou, Crypturellus noctivagus (E) (near-threatened) Black-capped tinamou, Crypturellus atrocapillus Variegated tinamou, Crypturellus variegatus Rusty tinamou, Crypturellus brevirostris Bartlett's tinamou, Crypturellus bartletti Small-billed tinamou, Crypturellus parvirostris Tataupa tinamou, Crypturellus tataupa Red-winged tinamou, Rhynchotus rufescens White-bellied nothura, Nothura boraquira Lesser nothura, Nothura minor (vulnerable) Spotted nothura, Nothura maculosa Dwarf tinamou, Taoniscus nanus (vulnerable) Screamers Order: AnseriformesFamily: Anhimidae The screamers are a small family of birds related to the ducks. They are large, bulky birds, with a small downy head, long legs, and large feet which are only partially webbed. They have large spurs on their wings which are used in fights over mates and in territorial disputes. Horned screamer, Anhima cornuta Southern screamer, Chauna torquata Ducks Order: AnseriformesFamily: Anatidae Anatidae includes the ducks and most duck-like waterfowl, such as geese and swans. These birds are adapted to an aquatic existence with webbed feet, flattened bills, and feathers that are excellent at shedding water due to an oily coating. Fulvous whistling-duck, Dendrocygna bicolor White-faced whistling-duck, Dendrocygna viduata Black-bellied whistling-duck, Dendrocygna autumnalis Black-necked swan, Cygnus melancoryphus Coscoroba swan, Coscoroba coscoroba Orinoco goose, Oressochen jubatus (near-threatened) Upland goose, Chloephaga pictus (V) Muscovy duck, Cairina moschata Comb duck, Sarkidiornis sylvicola Ringed teal, Callonetta leucophrys Brazilian teal, Amazonetta brasiliensis Silver teal, Spatula versicolor Red shoveler, Spatula platalea Blue-winged teal, Spatula discors (V) Cinnamon teal, Spatula cyanoptera (V) Chiloe wigeon, Mareca sibilatrix White-cheeked pintail, Anas bahamensis Northern pintail, Anas acuta (V) Yellow-billed pintail, Anas georgica Yellow-billed teal, Anas flavirostris Southern pochard, Netta erythrophthalma Rosy-billed pochard, Netta peposaca Brazilian merganser, Mergus octosetaceus (critically endangered) Black-headed duck, Heteronetta atricapilla Masked duck, Nomonyx dominicus Lake duck, Oxyura vittata Guans Order: GalliformesFamily: Cracidae The Cracidae are large birds, similar in general appearance to turkeys. The guans and curassows live in trees, but the smaller chachalacas are found in more open scrubby habitats. They are generally dull-plumaged, but the curassows and some guans have colorful facial ornaments. Marail guan, Penelope marail Rusty-margined guan, Penelope superciliaris Spix's guan, Penelope jacquacu Dusky-legged guan, Penelope obscura White-crested guan, Penelope pileata (E) (vulnerable) Chestnut-bellied guan,