Cinereous Conebill occurs alone, in pairs, or in groups. It is very active, nervous, and often found in mixed flocks. Restlessly flitters about for insect and berries, often hanging, and spending most time along middle branches inside the vegetation (Fjeldså and Krabbe 1990). Pairs glean in foliage near tips of dense bushes, shrubs, or stunted trees (Hilty amd Brown 1986). Males sing from perches in center of established territories (Moynihan 1963).
Little information. There are no data on territory or home range size for Cinereous Conebill. It apparently is territorial, however, as the male sings from perches in center of established territories (Moynihan 1963).
Unknown. Cinereous Conebill presumably is at least socially monogamous.
Social and interspecific behavior
Can be solitary, but most often travels in groups of 2-6 individuals (Fjeldså and Krabbe 1990, Schulenberg et al. 2010). In southwestern Peru, sometimes associates with Tamarugo Conebill (Conirostrum tamarugense) (Schulenberg et al. 2010), and in southeastern Peru occasionally forages with White-browed Conebill (Conirostrum ferrugineiventre) and Blue-backed Conebill (Conirostrum sitticolor) (Parker and O'Neill 1980).
No reported instances of predation on Cinereous Conebill.