- Radde's Warbler
- Razorbill
- Red-and-green Macaw
- Red-backed Shrike
- Red-billed Chough
- Red-billed Parrot
- Red-billed Pigeon
- Red-billed Tropicbird
- Red-breasted Flycatcher
- Red-breasted Goose
- Red-breasted Meadowlark
- Red-breasted Merganser
- Red-breasted Toucan
- Red-capped Cardinal
- Red-capped Manakin
- Red-crested Cardinal
- Red-crested Cotinga
- Red-crested Pochard
- Red-crowned Woodpecker
- Red-eyed Vireo
- Red-faced Spinetail
- Red-flanked Bluetail
- Red-footed Booby
- Red-footed Falcon
- Red-fronted Coot
- Red-fronted Macaw
- Red-fronted Serin
- Red-gartered Coot
- Red-hooded Tanager
- Red-legged Cormorant
- Red-legged Honeycreeper
- Red-legged Partridge
- Red-lored Amazon
- Red-necked Grebe
- Red-necked Phalarope
- Red-necked Woodpecker
- Red-tailed Shrike
- Red-throated Ant Tanager
- Red-throated Caracara
- Red-throated Loon
- Red-throated Pipit
- Red-winged Tinamou
- Red Crossbill
- Red Kite
- Red Knot
- Red Phalarope
- Red Pileated Finch
- Red Shoveler
- Reddish-winged Bare-eye
- Redpoll
- Redpoll (cabaret)
- Redpoll (hornemanni)
- Redwing
- Resplendent Quetzal
- Richard's Pipit
- Ring-billed Gull
- Ring-necked Duck
- Ring Ouzel
- Ringed Kingfisher
- Riverside Wren
- Rivoli's Hummingbird
- Roadside Hawk
- Rock Bunting
- Rock Dove
- Rock Earthcreeper
- Rock Ptarmigan
- Rock Shag
- Rock Sparrow
- Rook
- Rose-ringed Parakeet
- Roseate Spoonbill
- Roseate Tern
- Ross's Goose
- Ross's Gull
- Rosy-billed Pochard
- Rosy Starling
- Rough-legged Buzzard
- Round-tailed Manakin
- Royal Tern
- Ruddy-capped Nightingale-Thrush
- Ruddy-tailed Flycatcher
- Ruddy Foliage-gleaner
- Ruddy Ground Dove
- Ruddy Shelduck
- Ruddy Treerunner
- Ruddy Turnstone
- Rufescent Flycatcher
- Rufescent Tiger Heron
- Ruff
- Rufous-banded Miner
- Rufous-banded Owl
- Rufous-bellied Bush Tyrant
- Rufous-bellied Seedsnipe
- Rufous-booted Racket-tail
- Rufous-breasted Antthrush
- Rufous-breasted Chat-Tyrant
- Rufous-breasted Hermit
- Rufous-browed Peppershrike
- Rufous-capped Antshrike
- Rufous-capped Spinetail
- Rufous-capped Thornbill
- Rufous-chested Dotterel
- Rufous-collared Sparrow
- Rufous-collared Thrush
- Rufous-crested Coquette
- Rufous-crowned Tody-Flycatcher
- Rufous-eared Brushfinch
- Rufous-fronted Thornbird
- Rufous-headed Woodpecker
- Rufous-naped Ground Tyrant
- Rufous-sided Crake
- Rufous-tailed Hummingbird
- Rufous-tailed Scrub Robin
- Rufous-winged Woodpecker
- Rufous Casiornis
- Rufous Hornero
- Rufous Motmot
- Rufous Sabrewing
- Rufous Spinetail
- Rüppell's Warbler
- Russet-backed Oropendola
- Russet-crowned Warbler
- Rust-and-yellow Tanager
- Rustic Bunting
- Rusty-backed Spinetail
- Rusty-collared Seedeater
- Rusty-fronted Canastero
- Rusty-margined Flycatcher
- Rusty Flowerpiercer