A pair of things is two things. You usually use the word pair to describe two very similar things, like a pair of birds. Some things only come in pairs - like a pair of glasses or a pair of trousers. Many other things usually come in pairs but can be separated, like a pair of socks, shoes or gloves.
Pis forPod (Group)
A group of hedgehogs or porcupines is called a prickle.
Pis forPride (Group)
A group of mountains all in a row is called a range.
