Glaucous-blue Grosbeak vs Ultramarine Grosbeak

In short

The Glaucous-blue Grosbeak and Ultramarine Grosbeak are both striking blue grosbeaks, but can be distinguished by plumage details and habitat preferences. The Ultramarine Grosbeak has a pale supercilium and malar, while the Glaucous-blue Grosbeak is more uniformly blue. Both species have large, thick bills.

Identification tips

• Look for the pale supercilium and malar on the Ultramarine Grosbeak.
• Note the more uniform blue of the Glaucous-blue Grosbeak.
• Consider habitat: Ultramarine Grosbeak may be in dense scrub or forest edges.
• Listen for the Ultramarine Grosbeak's loud song if visibility is poor.

Size

Both species are similar in size, typical of grosbeaks.

Plumage

The male Ultramarine Grosbeak is a deep, rich blue with a pale supercilium and malar and black lores. The Glaucous-blue Grosbeak is more uniformly blue without these pale facial markings.

Behaviour

Both species can be reclusive and are often heard more than seen. The Ultramarine Grosbeak is known for inhabiting thick patches of scrub.

Habitat

The Ultramarine Grosbeak is found in a variety of habitats, including forests and shrubs, with subspecies showing habitat preferences. The Glaucous-blue Grosbeak's habitat preferences are less detailed in the sources.

Voice

The Ultramarine Grosbeak is noted for its loud, far-reaching song, while specific vocalization details for the Glaucous-blue Grosbeak are not provided.