Biparental Care in a Southeast Asian Passerine, the Scarlet–Backed Flowerpecker (<i>Dicaeum cruentatum</i>)

We opportunistically observed a nest pair of scarlet-backed flowerpeckers (<i>Dicaeum cruentatum</i>) for 5 days during the fledging period in late February 2020 within the Sakaerat Biosphere Reserve, Nakhon Ratchasima, Thailand. We observed both parents feeding the fledgling, with either parent returning within 3-20 min of leaving to forage. Over 5 days, both parents fed the fledgling green mistletoe fruits (<i>Dendrophthoe pentandra</i> [L.] Miq., family <i>Loranthaceae</i>). Between feeding periods, the fledgling remained mostly stationary on its perch. Our observations are similar to those reported for other species in the flowerpecker family (Dicaeidae), suggesting that biparental care is relatively common across the flowerpecker family, though there remains a paucity of direct observations and reporting. By making direct observations and subsequent discussions, we can better understand the ecology and natural history of <i>Dicaeidae</i> species, ultimately aiding in their conservation.