What is the collective noun for hummingbird?

There isn't a widely accepted, traditional collective noun for hummingbirds.

Here are some options you could use, however:

Humorous:

* A shimmer of hummingbirds

* A blur of hummingbirds

* A buzz of hummingbirds

* A flutter of hummingbirds

Descriptive:

* A swarm of hummingbirds

* A cloud of hummingbirds

* A flurry of hummingbirds

Ultimately, the best choice depends on the context and the desired effect.