My grandfather keeps several finches as pets, and we enjoy their cheerful singing every morning.

finches 是名词 finch 的复数形式，finch 指"雀科鸟类"，包括金丝雀、燕雀等小型鸣禽。这类鸟通常体型小巧，叫声悦耳，常被作为观赏鸟饲养。