Red-underwing Dove (_Leptoptila rufaxilla_). * Hoatzin (_Opisthocomus hoazin_). * Wood Rail (_Aramides cayana_). Purple Gallinule (_Ionornis martinica_). Great-billed Tern (_Phaëthusa magnirostris_). Eye-browed Tern (_Sterna superciliaris_). * Jacana (_Jacana jacana_). Wood Ibis (_Tantalus loculator_). Jabiru (_Mycteria americana_). Cocoi Heron (_Ardea cocoi_). American Egret (_Herodias egretta_). * Guiana Green Heron (_Butorides striata_). Horned Screamer (_Palamedea cornuta_). Muscovy Duck (_Cairina moschata_). Rufous Tree-duck (_Dendrocygna fulva_). Gray-necked Tree-duck (_Dendrocygna discolor_). Guiana Cormorant (_Phalacrocorax vigua_). Snakebird (_Plotus anhinga_). Black Vulture (_Catharista urubu_). Yellow-headed Vulture (_Catharista urubitinga_). Caracara (_Polyborus cheriway_). South American Blue Hawk (_Geranospizias caerulescens_). * South American Black Hawk (_Urubitinga urubitinga_). * Rufous Kingfisher (_Ceryle torquata_). Parauque (_Nyctidromus albicollis_). Goatsucker (sp?). Green Hummingbird (sp?). Little Rufous Cuckoo (_Piaya rutila_). Smooth-billed Ani (_Crotophaga ani_). * Cinnamon Spine-tail (_Synallaxis cinnamomea_). * Pied Ground Flycatcher (_Fluvicola pica_). * White-headed Flycatcher (_Arundicola leucocephala_). * Cinereus Tody-flycatcher (_Todirostrum cinereum_). * Guiana Kiskadee Tyrant (_Pitangus sulphuratus_). * Lesser Kiskadee Tyrant (_Pitangus lictor_). * Large-billed Kiskadee Tyrant (_Megarhynchus pitangua_). * White-throated Kingbird (_Tyrannus melancholicus_). Tree Swallow (_Tachycineta bicolor_). Variegated Swallow (_Tachycineta albiventris_). Barn Swallow (_Hirundo erythrogaster_). * Gray-breasted Martin (_Progne chalybea_). Red-breasted Swallow (_Stelgidopteryx ruficollis_). * Guiana House Wren (_Troglodytes musculus clarus_). * Black-capped Mocking-thrush (_Donacobius atricapillus_). * Pygmy Seedeater (_Sporophila minuta_). Little Yellow-headed Blackbird (_Agelaius icterocephalus_). Red-breasted Blackbird (_Leistes militaris_). Meadow Lark (_Sturnella magna meridionalis_). * Yellow Oriole (_Icterus xanthornus_). Little Boat-tailed (_Guiana_) Grackle (_Quiscalus lugubris_). The most interesting of all were the Hoatzins,[11] whose raucous squawks brought vividly to our minds the mangrove swamps of Venezuela where we had studied them last year. [Illustration: FIG. 150. NEST OF A HOATZIN IN THE MUCKA-MUCKA ON WHICH THESE BIRDS FEED.]