- Rabid Wolf Spider
- Radiated Wolf Spider
- Rainbow Bee-eater
- Rainbow Lorikeet
- Rainbow Trout
- Rambur's Forktail
- Rathke's Woodlouse
- Razorbill
- Reakirt's Blue
- Red Admiral
- Red cabbage bug
- Red Collared-Dove
- Red Cone Gall Wasp
- Red Cornsnake
- Red Crossbill
- Red Deer
- Red Fox
- Red Harvester Ant
- Red Imported Fire Ant
- Red Junglefowl
- Red Kite
- Red Knot
- Red Mason Bee
- Red Milkweed Beetle
- Red Nail Gall Mite
- Red Peacock
- Red Pine Longhorn Beetle
- Red Rock Crab
- Red Saddlebags
- Red Sponge Dorid
- Red Swamp Crayfish
- Red Wattlebird
- Red-backed Shrike
- Red-banded Hairstreak
- Red-banded Leafhopper
- Red-banded Leafroller Moth
- Red-based Jezebel
- Red-bellied Black Snake
- Red-bellied Jumping Spider
- Red-bellied Snake
- Red-bellied Squirrel
- Red-bellied Woodpecker
- Red-belted Bumble Bee
- Red-billed Chough
- Red-breasted Carrion Beetle
- Red-breasted Merganser
- Red-breasted Nuthatch
- Red-breasted Sapsucker
- Red-browed Finch
- Red-crested Cardinal
- Red-crested Pochard
- Red-crowned Amazon
- Red-crowned Woodpecker
- Red-eyed Damselfly
- Red-eyed Dove
- Red-eyed Tree Frog
- Red-eyed Vireo
- Red-headed Bush Cricket
- Red-headed Woodpecker
- Red-knobbed Coot
- Red-legged Grasshopper
- Red-legged Honeycreeper
- Red-legged Partridge
- Red-lined Panopoda Moth
- Red-necked Grebe
- Red-necked Phalarope
- Red-necked Stint
- Red-necked Wallaby
- Red-rumped Parrot
- Red-shouldered Bug
- Red-shouldered Hawk
- Red-spotted Admiral
- Red-spotted Plant Bug
- Red-spotted Toad
- Red-tailed Bumble Bee
- Red-tailed Hawk
- Red-tailed Squirrel
- Red-throated Loon
- Red-veined Dropwing
- Red-vented Bulbul
- Red-wattled Lapwing
- Red-whiskered Bulbul
- Red-winged Blackbird
- Redbreast Sunfish
- Reddish Egret
- Reddish-brown Stag Beetle
- Redhead
- Redpoll
- Redwing
- Reed Bunting
- Resh Cicada
- Reticulated Fruitworm Moth
- Reticulated Net-winged Beetle
- Rhesus Macaque
- Rhododendron Leafhopper
- Riband Wave
- Ribbed Pine Borer
- Ring-billed Gull
- Ring-necked Duck
- Ring-necked Pheasant
- Ring-necked Snake
- Ringed Kingfisher
- Ringlet
- River Cooter
- Roadside Hawk
- Rock Bass
- Rock Bunting
- Rock Pigeon
- Rock Squirrel
- Rock Wren
- Roesel's Bush-cricket
- Roman Snail
- Rook
- Rose-bellied Lizard
- Rose-breasted Grosbeak
- Rose-ringed Parakeet
- Roseate Skimmer
- Roseate Spoonbill
- Rosemary Beetle
- Ross's Goose
- Rosy Footman
- Rosy Maple Moth
- Rosy Tabby
- Rosy-striped Knot-horn
- Rough Earthsnake
- Rough Greensnake
- Rough Harvester Ant
- Rough-legged Hawk
- Rough-skinned Newt
- Round-mouthed Snail
- Rounded Snail
- Royal Spoonbill
- Royal Tern
- Ruby Tiger Moth
- Ruby-crowned Kinglet
- Ruby-throated Hummingbird
- Ruddy Daggerwing
- Ruddy Darter
- Ruddy Duck
- Ruddy Ground Dove
- Ruddy Shelduck
- Ruddy Turnstone
- Rufescent Tiger-Heron
- Ruff
- Ruffed Grouse
- Rufous Grasshopper
- Rufous Hornero
- Rufous Hummingbird
- Rufous Whistler
- Rufous-backed Robin
- Rufous-bellied Thrush
- Rufous-collared Sparrow
- Rufous-crowned Sparrow
- Rufous-tailed Hummingbird
- Rush Veneer
- Russet Percher
- Rustic
- Rustic Sailor Beetle
- Rustic Sphinx
- Rusty Blackbird
- Rusty Dot Pearl
- Rusty Millipede
- Rusty Tussock Moth