What is a group of deer called?

There isn't a formally recognized group name for deer that's universally used like "pride" for lions or "flock" for sheep. The collective noun used depends on the context and the species of deer. You might hear deer referred to in these ways:

• A herd of deer: This is the most common and widely accepted collective noun for deer. It's used generically and applies to most deer species.

• A parcel of deer: Less common, but acceptable, particularly if referring to a smaller, more tightly knit group.

• A richness of deer: This is a more poetic or literary term, emphasizing the abundance of deer.

Ultimately, "a herd of deer" is the safest and most widely understood term to use when referring to a group of deer.