sparrow, swallow, seagull,
swallow, swan
There are a lot of words that begin in the letter s like: see,sea,saw,shape,share,super,shop, and many more.
There are many bird species and varieties which begin with 'S'. Here are a few examples, in alphabetical order: Sabine's gull, Sabota bushlark, Sand martin, Sanderling, Sandgrouse, Sandpipers,...
Zamboanga Bulbul Zanzibar Bishop Zapata Rail Zapata Sparrow or Cuban Sparrow Zapata Wren Zebra Dove Zebra Finch Zebra Waxbill Zenaida Dove Zenker's Honeyguide Zigzag Heron Zimmer's...