- Shining Honeycreeper
- Shining Sunbeam
- Shining Sunbird
- Shiny Cowbird
- Shiny Whistling Thrush
- Shiziling Forestry Laoshan Mountain (Jiangpu Nanjing)
- Shoebill
- Shoolpaneshwar Wildlife Sanctuary
- Shore Dotterel
- Short-bearded Melidectes
- Short-billed Bush Tanager
- Short-billed Canastero
- Short-billed Dowitcher
- Short-billed Honeycreeper
- Short-billed Leaftosser
- Short-billed Miner
- Short-billed Minivet
- Short-billed Pigeon
- Short-billed Pipit
- Short-clawed Lark
- Short-crested Coquette
- Short-crested Flycatcher
- Short-crested Monarch
- Short-eared Owl
- Short-legged Ground Roller
- Short-tailed Albatross
- Short-tailed Antthrush
- Short-tailed Babbler
- Short-tailed Emerald
- Short-tailed Field Tyrant
- Short-tailed Finch
- Short-tailed Frogmouth
- Short-tailed Grasswren
- Short-tailed Green Magpie
- Short-tailed Hawk
- Short-tailed Lark
- Short-tailed Nighthawk
- Short-tailed Paradigalla
- Short-tailed Parrot
- Short-tailed Parrotbill
- Short-tailed Pipit
- Short-tailed Pygmy Tyrant
- Short-tailed Scimitar Babbler
- Short-tailed Shearwater
- Short-tailed Starling
- Short-tailed Swift
- Short-tailed Woodstar
- Short-tailed Wren-Babbler
- Short-toed Coucal
- Short-toed Rock Thrush
- Short-toed Snake Eagle
- Short-toed Treecreeper
- Short-winged Cisticola
- Shovel-billed Kookaburra
- Shrike-like Cotinga
- Shy Heathwren
- Siamese Fireback
- Siao Pitta
- Siau Scops Owl
- Siberian Accentor
- Siberian Blue Robin
- Siberian Crane
- Siberian Grouse
- Siberian Jay
- Siberian Rubythroat
- Siberian Stonechat
- Siberian Thrush
- Sibilant Sirystes
- Sichuan Bush Warbler
- Sichuan Jay
- Sichuan Leaf Warbler
- Sichuan Partridge
- Sichuan Thrush
- Sichuan Tit
- Sichuan Treecreeper
- Sick's Swift
- Sickle-billed Vanga
- Sickle-winged Chat
- Sickle-winged Guan
- Sickle-winged Nightjar
- Sicklebill
- Sidi Bou Ghaba Reserve
- Siemianowka Reservoir
- Sierra Leone Prinia
- Sierra Madre Ground Warbler
- Sierra Madre Sparrow
- Sierra Nevada Brushfinch
- Sierra de Gredos
- Sierra de Guadarrama
- Sierran Elaenia
- Sikkim Treecreeper
- Silent Valley LNR
- Silktail
- Silky-tailed Nightjar
- Sillem's Mountain Finch
- Silver-backed Butcherbird
- Silver-backed Needletail
- Silver-backed Tanager
- Silver-beaked Tanager
- Silver-breasted Broadbill
- Silver-capped Fruit Dove
- Silver-crowned Friarbird
- Silver-eared Honeyeater
- Silver-eared Laughingthrush
- Silver-eared Mesia
- Silver-rumped Spinetail
- Silver-throated Tanager
- Silver-throated Tit
- Silver-tipped Imperial Pigeon
- Silver Gull
- Silver Oriole
- Silver Pheasant
- Silver Teal
- Silverbird
- Silvered Antbird
- Silvereye
- Silvery-cheeked Antshrike
- Silvery-cheeked Hornbill
- Silvery-fronted Tapaculo
- Silvery-throated Jay
- Silvery-throated Spinetail
- Silvery Grebe
- Silvery Kingfisher
- Silvery Pigeon
- Sime Track(MacRitchie Reservoir)
- Simeulue Scops Owl
- Simple Greenbul
- Sinai Rosefinch
- Sinaloa
- Sinaloa Crow
- Sinaloa Martin
- Sinaloa Wren
- Sincora Antwren
- Sind Sparrow
- Sind Woodpecker
- Singalila National Park (West Bengal)
- Singapore
- Singing Bush Lark
- Singing Bushlark
- Singing Cisticola
- Singing Honeyeater
- Singing Parrot
- Singing Quail
- Singing Starling
- Sinharaja
- Sira Curassow
- Sira Tanager
- Sirkeer Malkoha
- Sirystes
- Sivrikaya
- Sjöstedt's Greenbul
- Sjöstedt's Owlet
- Skaftafell National Park
- Skagen
- Skallingen Nature Reserve
- Skokholm
- Skomer
- Sladen's Barbet
- Slapton Ley
- Slate-colored Antbird
- Slate-colored Boubou
- Slate-colored Coot
- Slate-colored Grosbeak
- Slate-colored Hawk
- Slate-colored Seedeater
- Slate-colored Solitaire
- Slate-crowned Antpitta
- Slate-headed Tody-Flycatcher
- Slate-throated Gnatcatcher
- Slate-throated Redstart
- Slaty-backed Chat-Tyrant
- Slaty-backed Flycatcher
- Slaty-backed Forest Falcon
- Slaty-backed Forktail
- Slaty-backed Gull
- Slaty-backed Hemispingus
- Slaty-backed Jungle Flycatcher
- Slaty-backed Nightingale-Thrush
- Slaty-backed Thornbill
- Slaty-backed Thrush
- Slaty-bellied Tesia
- Slaty-blue Flycatcher
- Slaty-breasted Rail
- Slaty-breasted Tinamou
- Slaty-breasted Wood Rail
- Slaty-capped Flycatcher
- Slaty-capped Shrike-Vireo
- Slaty-chinned Longbill
- Slaty-headed Parakeet
- Slaty-legged Crake
- Slaty-mantled Goshawk
- Slaty-tailed Trogon
- Slaty-winged Foliage-gleaner
- Slaty Antwren
- Slaty Becard
- Slaty Bristlefront
- Slaty Brushfinch
- Slaty Bunting
- Slaty Cuckooshrike
- Slaty Egret
- Slaty Elaenia
- Slaty Finch
- Slaty Flowerpiercer
- Slaty Flycatcher
- Slaty Gnateater
- Slaty Monarch
- Slaty Spinetail
- Slaty Tanager
- Slaty Thrush
- Slaty Vireo
- Slender-billed Babbler
- Slender-billed Crow
- Slender-billed Cuckoo-Dove
- Slender-billed Curlew
- Slender-billed Finch
- Slender-billed Flufftail
- Slender-billed Grackle
- Slender-billed Greenbul
- Slender-billed Gull
- Slender-billed Kite
- Slender-billed Miner
- Slender-billed Oriole
- Slender-billed Parakeet
- Slender-billed Prion
- Slender-billed Scimitar Babbler
- Slender-billed Starling
- Slender-billed Thornbill
- Slender-billed Tyrannulet
- Slender-billed Vulture
- Slender-billed Weaver
- Slender-billed White-eye
- Slender-billed Xenops
- Slender-footed Tyrannulet
- Slender-tailed Nightjar
- Slender-tailed Woodstar
- Slender Antbird
- Slender Sheartail
- Slimbridge
- Slonsk Reserve
- Small-billed Elaenia
- Small-billed Tinamou
- Small-headed Elaenia
- Small Ground Finch
- Small Lifou White-eye
- Small Minivet
- Small Niltava
- Small Pratincole
- Small Tree Finch
- Smardale Gill
- Smew
- Smith's Longspur
- Smoke-colored Pewee
- Smoky-brown Woodpecker
- Smoky-fronted Tody-Flycatcher
- Smoky Bush Tyrant
- Smoky Honeyeater
- Smoky Robin
- Smoky Warbler
- Smola
- Smooth-billed Ani
- Snail-eating Coua
- Snail Kite
- Snares Penguin
- Snares Snipe
- Snethlage's Antpitta
- Snethlage's Tody-Tyrant
- Snettisham
- Snoring Rail
- Snow-capped Manakin
- Snow Bunting
- Snow Goose
- Snow Mountain Mannikin
- Snow Mountain Quail
- Snow Mountain Robin
- Snow Partridge
- Snow Petrel
- Snow Pigeon
- Snowcap
- Snowy-bellied Hummingbird
- Snowy-browed Flycatcher
- Snowy-cheeked Laughingthrush
- Snowy-crowned Robin-Chat
- Snowy-crowned Tern
- Snowy-throated Babbler
- Snowy-throated Kingbird
- Snowy Cotinga
- Snowy Egret
- Snowy Owl
- Snowy Plover
- Snowy Sheathbill
- Soberania National Park
- Sociable Lapwing
- Sociable Weaver
- Social Flycatcher
- Social Weaver
- Society Islands Reed Warbler
- Society Kingfisher
- Socorro Dove
- Socorro Mockingbird
- Socorro Parakeet
- Socorro Wren
- Socotra
- Socotra Bunting
- Socotra Buzzard
- Socotra Cisticola
- Socotra Cormorant
- Socotra Scops Owl
- Socotra Sparrow
- Socotra Starling
- Socotra Sunbird
- Socotra Warbler
- Sodviken (Oland)
- Soft-plumaged Petrel
- Soguksu National Park
- Sokoke Pipit
- Sokoke Scops Owl
- Solitary Cacique
- Solitary Eagle
- Solitary Sandpiper
- Solitary Snipe
- Solitary Tinamou
- Sologne
- Solomon Crow
- Solomons Boobook
- Solomons Cockatoo
- Solomons Cuckooshrike
- Solomons Frogmouth
- Solomons Nightjar
- Solomons White-eye
- Somali Bee-eater
- Somali Bunting
- Somali Courser
- Somali Crombec
- Somali Crow
- Somali Fiscal
- Somali Grosbeak
- Somali Lark
- Somali Long-billed Lark
- Somali Ostrich
- Somali Pigeon
- Somali Short-toed Lark
- Somali Sparrow
- Somali Starling
- Somali Thrush
- Somali Tit


