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Sierra Leone Prinia

Schistolais leontica

Sierra Madre Sparrow

Xenospiza baileyi

Sierra Maestra Blotched Frog

Eleutherodactylus michaelschmidi

Sierra Maestra Long-legged Frog

Eleutherodactylus maestrensis

Eleutherodactylus manantlanensis

Sierra Negra Giant Tortoise

Chelonoidis guntheri

Sierra Nevada Yellow-legged Frog

Rana sierrae

Sierra Nevadan Grasshopper

Chorthippus nevadensis

Sierra Nevadan Pygmy Wart-biter

Ctenodecticus major

Sierra Nevadan Saddle Bush-cricket

Baetica ustulata

Sierra Rocket Frog

Aromobates serranus

Sieve-tooth Moss

Coscinodon cribrosus

Sikkim Balsam

Impatiens sikkimensis

Sikkim Grass Lizard

Takydromus sikkimensis

Siku Rainbowfish

Melanotaenia sikuensis

Silent Grass Mouse

Akodon surdus

Silent Valley Stone Sucker

Garra menoni

Silhouette giant mite

Dicrogonatus niger

Silk Cotton Purslane

Portulaca halimoides

Silky Fibrecap

Inocybe fibrosa

Silky Oldfield Mouse

Thomasomys bombycinus

Silky Shark

Carcharhinus falciformis

Silky Shrew Opossum

Caenolestes fuliginosus

Silky Sifaka

Propithecus candidus

Silky-hair Pincushion

Leucospermum vestitum