chatterer

noun

1. A person who chatters; a chatterbox.

   “Yes, I am a chatterer, indeed, to interrupt you so often, Monsieur.”

   ““I don't mean all of your friends—only a small proportion—which, however, connects your circle with that deadly, idle, brainless bunch—the insolent chatterers at the opera, the gorged dowagers,[…]the chlorotic squatters on huge yachts, the speed-mad fugitives from the furies of ennui, the neurotic victims of mental cirrhosus,[…]!””

   “Indeed the difficulty was to get him to stop talking, for, like all squirrels, he was a chatterer.”

2. (dated)Any of several passerine birds, mostly from South America; especially the cotingas.

   “Why is the variegated chatterer of South America also called the bell-bird?”

   “The flight of the Chatterer bears much resemblance to that of the starling.”

   “In most parts of tropical America we may always find some species of woodpecker[,] tanager, bush-shrike, chatterer, trogon, toucan, cuckoo, and tyrant-flycatcher; and a few days' active search will produce more variety than can be here met with in as many months.”