- S
- saline
- sandpipers
- savanna
- scapulars
- scavenger
- scoters
- screeching
- scrub
- seabird
- season
- seed
- sex
- Shandon Mount
- shearwaters
- shorebird
- short
- shrill
- silhouette
- size
- solitary
- song
- songbird
- spawn
- speckled
- speculum
- SPNI
- spoonbills
- starlings
- steppe
- streak
- subarctic
- subspecies
- subterminal
- superciliary
- swamp
- swans
- syllable