- Medium-sized tern.
- White with black cap.
- Tail long and deeply forked.
- Wings white.
- Bill black.
Immature DescriptionJuvenile with dark head, and scaly pattern across back. Immature resembles winter adult, but has darker wingtips.
Relative Sizebetween robin and crow
- Both Sexes
- Length: 13.0-16.1 in (33-41 cm)
- Weight: 3.2-4.9 oz (90-140 g)