Least Tern vs Caspian Tern

The Least Tern is a small tern with a slender build, while the Caspian Tern is significantly larger and more robust. Key differences include bill size and color, as well as wing shape and flight style. Their calls are notably different, aiding in identification.

1. Size and Structure: Look for the Least Tern's small size and slender build versus the Caspian Tern's large, robust form. 2. Bill Color and Size: Least Terns have a yellow bill, while Caspian Terns have a thick, red bill. 3. Flight Style: Least Terns hover and dive quickly; Caspian Terns soar with slow wing beats. 4. Calls: Listen for the Least Tern's sharp calls compared to the Caspian Tern's loud, raucous calls. 5. Habitat: Consider location; Least Terns are more likely on open beaches, while Caspian Terns are found along larger bodies of water.

The Least Tern is the smallest North American tern, whereas the Caspian Tern is the largest tern globally.

Least Terns have a black cap and white forehead during the breeding season, with a yellow bill. Caspian Terns have a black cap but a more substantial, bright red bill and a darker underwing.

Least Terns are agile fliers, often seen hovering before diving for fish. Caspian Terns have a more powerful and gull-like flight, often soaring and wheeling.

Least Terns prefer open beaches and river islands, while Caspian Terns are found along coastlines, lakes, and rivers, often on flat, rocky islands or sandy shores.

Least Terns have a high-pitched, sharp call, while Caspian Terns produce a loud, raucous call.