Whiskered Tern vs Common Tern

In short

The Whiskered Tern and Common Tern can be distinguished by their tail shape and plumage. The Whiskered Tern has a shorter, less forked tail and darker underparts, while the Common Tern features a longer, deeply forked tail and lighter plumage. Both species have similar habitats and behaviors, but their calls differ, with the Whiskered Tern having a harsher call.

Identification tips

1. Tail Shape: Whiskered Tern has a shorter, less forked tail compared to the deeply forked tail of the Common Tern. 2. Plumage: Look for darker underparts in the Whiskered Tern during breeding season. 3. Vocalization: Listen for the harsher calls of the Whiskered Tern. 4. Seasonal Changes: Non-breeding Whiskered Terns appear paler with a dark-flecked crown, while Common Terns maintain a more uniform grey.

Size

Both species are similar in size, but the Whiskered Tern is slightly more compact with a shorter tail.

Plumage

In breeding plumage, the Whiskered Tern has a black cap extending to the nape with white cheeks and darker grey underparts. The Common Tern has a black cap and lighter grey underparts. In non-breeding plumage, the Whiskered Tern is paler with a dark-flecked crown, while the Common Tern retains a more uniform grey appearance.

Behaviour

Both species exhibit similar foraging behaviors, such as aerial dipping. However, the Whiskered Tern is noted for its harsher vocalizations.

Habitat

Both terns are found in similar wetland and coastal habitats, often seen over open water or marshes.

Voice

The Whiskered Tern has a harsher call, described as a rasping 'kyick' or 'cherk', while the Common Tern's call is more melodic and less harsh.