[4]  A recent study has found that this species is in particularly impacted by the larvae of the parasitic avian vampire fly (Philornis downsi).

[5] The small tree finch is found on all the main islands except Española, Genovesa, Marchena, Darwin, and Wolf.

In a study by Kleindorfer (2007), predation accounted for 60% of nest loss, making it a strong selective force.

Male ground finches are born grey/brown, similar to females, but through a pattern of annual moult, attain a black crown and chin (the upper part of their body).

Typically, it gleans arthropods and leaves from bark surfaces, but 42% of its diet consists of vegetable matter (nectar, fruits, and seeds).