My cat does this as well when a bird is close by.....they think they are going native with the lingo. Unless he is taking a course on the internet while I am out, my bird is just pretending to speak beak talk.
acorn - fruit of the oak tree: a smooth thin-walled nut in a woody cup-shaped base. acorn cup, cupule - cup-shaped structure of hardened bracts at the base of an acorn. oak tree, oak - a deciduous tree of the genus Quercus; has acorns and lobed leaves; great oaks grow from little acorns. fruit - the ripened reproductive body of a seed plant.
The acorn, or oak nut, is the nut of the oaks and their close relatives. It usually contains a single seed, enclosed in a tough, leathery shell, and borne in a cup-shaped cupule. Acorns are 1â6 cm long and 0.8â4 cm broad. Acorns take between 6 and 24 months to mature; see List of Quercus species for details of oak classification, in which acorn morphology and phenology are important factors.