A group of alligators is called a congregation.

Hallelujah!

A group of caterpillars is called an army.

Left right left!

A group of crows is called a murder.

In the study, with a candlestick.

A group of dolphins is called a pod.

Two peas.

A group of giraffes is called a tower.

Towering over the land.

A group of  hippopotamuses is called a bloat.

They DO look a little puffy...

A group of hummingbirds is called a charm.

Charming, ain't they?

A group of lizards is called a lounge.

Just lounging around...

A group of mice is called a mischief.

Up to no good!

A group of owls is called a parliament.

Question period.

A group of porcupines is called a prickle.

Ouch!

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EnchantedLearning.com: Names of Males, Females, Babies, and Groups of Animals