The Medium Ground Finch is endemic to the Galapagos and mainly eats seeds. On Santa Cruz, individuals vary in beak size.
On Santa Cruz, some individuals have small beaks and others large beaks. Even large-beaked birds have less beak depth and a smaller overall impression than Large Ground Finches.
It mainly eats seeds but also visits flowers. The Galapagos species record also notes nests built in cacti.
An extinction-risk assessment has not been added yet.