The names given to animal groups, which may or may not include babies of the species, are sometimes well-known or easily understood. It's common, for example, for a group of birds to be known as a flock, or a group of large mammals to be called a herd. Exactly why groups of mice and rats are both called mischief, but a group of moles is a labor, is a bit of a puzzle. Why a group of owls is a parliament and a group of nightingales is a watch instead of a flock is a mystery. The fact that a group of crickets is called an orchestra is somewhat amusing, considering the sound they make together.