This species feeds on small invertebrates, the remains of land crabs ("Gecarcinus planatus") and fruit, namely of the endemic shrubs "Ilex socorrensis" and "Sideroxylon socorrense", the latter of which has also become rare. Flies are pecked up but do not seem to be snatched out of the air. Like many Mimidae, the Socorro mockingbird is an aggressive, solitary species living alone or with its partner. When they come together at a plentiful food source – e.g. blowflies on a carcass – there is a marked social hierarchy between birds and rarely are more than two or three actively feeding; the less dominant birds hang around nearby, waiting for their turn.