Thick-billed Spiderhunter vs Long-billed Spiderhunter

In short

The Thick-billed Spiderhunter (Arachnothera crassirostris) and Long-billed Spiderhunter (Arachnothera robusta) can be distinguished primarily by their bill shape and size. The Thick-billed has a notably shorter and thicker bill, while the Long-billed sports a longer, more slender bill. Both species share similar plumage, making bill structure the most reliable field mark.

Identification tips

1. Check the bill: The Thick-billed Spiderhunter has a shorter, thicker bill, while the Long-billed Spiderhunter has a longer, more slender bill. 2. Consider the habitat: If observed at higher elevations, it is more likely to be a Long-billed Spiderhunter. 3. Ignore plumage: Plumage is too similar to be useful for identification.

Size

Both species are similar in overall size, but the Long-billed Spiderhunter appears slightly larger due to its longer bill.

Plumage

Plumage is similar between the two species, with both having olive-green upperparts and streaked underparts. Coloration is not a reliable distinguishing feature.

Behaviour

Both species exhibit similar foraging behaviors, often seen probing flowers for nectar.

Habitat

Both species are found in forested areas, but the Long-billed Spiderhunter may be found at slightly higher elevations.

Voice

Vocalizations are not a primary distinguishing feature between these two species, as they are generally similar.