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.
Animals That Consume Acorns. Acorns provide food for a wide range of animals. Comstock/Comstock/Getty Images. Acorns, the large, nut-like seeds produced by oak trees, are a food source for a wide range of animal species. Acorns are generally split into two categories: white oak and red oak. White oak acorns are generally more palatable to animals than red oak acorns, because they contain fewer tannins, which give acorns their bitter flavor. However, many species will eat both varieties.