Small and Medium-sized Terns

Least Tern

breeding

1st-year

breeding

(Mar–Sep)

breeding

(Mar–Sep)

breeding

(Mar–Aug)

breeding

(Feb–Aug)

breeding

(Apr–Oct)

nonbr.

(Aug–Feb)

nonbr.

(Sep–Mar)

nonbr.

(Aug–Mar)

nonbr.

(Aug–Mar)

Common Tern

breeding

1st-year

Arctic Tern

1st-year

Forster’s Tern

nonbr.

Gull-billed Tern

nonbr.