Black-necked Swan vs Trumpeter Swan

In short

The Black-necked Swan is easily distinguished from the Trumpeter Swan by its striking black neck and head, contrasted with a white body and a prominent red knob at the base of the bill. In contrast, the Trumpeter Swan is entirely white with no such markings.

Identification tips

• Neck and Head Color: Look for the black neck and head of the Black-necked Swan, absent in the Trumpeter Swan.
• Bill Features: Note the red knob at the base of the Black-necked Swan's bill.
• Overall Plumage: The Trumpeter Swan is completely white, while the Black-necked Swan has contrasting black and white plumage.
• Vocalization: Listen for the Trumpeter Swan's trumpet-like call, which is not present in the Black-necked Swan.

Size

Both swans are large, but the Trumpeter Swan is generally larger and heavier than the Black-necked Swan.

Plumage

The Black-necked Swan has a distinctive black neck and head with a red knob at the bill's base, while the Trumpeter Swan is uniformly white without any contrasting neck color or bill knob.

Behaviour

Both species are social and can be found in flocks, but the Black-necked Swan is often seen in large aggregations, sometimes numbering in the thousands.

Habitat

Black-necked Swans are found in freshwater and brackish lakes, bays, and fjords, primarily in South America. Trumpeter Swans inhabit similar wetland environments in North America, including lakes, ponds, and marshes.

Voice

The Trumpeter Swan is known for its loud, trumpet-like call, which is a key distinguishing feature from the Black-necked Swan, which is generally quieter.