Common Tern vs Royal Tern

In short

The bill size and shape is the most reliable field mark to differentiate between the Common Tern and the Royal Tern. Common Terns have a slender, pointed bill, while Royal Terns possess a thicker, more robust bill. Both species are terns, but their size and social behavior can also help in identification.

Identification tips

1. Look for the bill size and shape: Common Terns have a slender, pointed bill, while Royal Terns have a thicker, more robust bill. 2. Consider the size: Royal Terns are larger. 3. Observe behavior: Royal Terns are more social and noisy.

Size

Royal Terns are generally larger and more robust than Common Terns.

Plumage

Common Terns have a more slender appearance with a sleeker plumage, whereas Royal Terns are bulkier with a more pronounced crest.

Behaviour

Royal Terns are typically more social and noisy, often found in large, conspicuous groups. Common Terns are less noisy and may be seen in smaller groups.