How do leprechauns communicate with other leprechauns?

They will use a Gaelic dialect at a very high frequency beyond human hearing, Like Mr. Spock, they are frequently drawn with pointed ears- ah there is method in the madness. so some science between the Malarky!

they have tails and they connect them with another leprechauns and there is a special wave that goes from one tail to another. this works because a leprechauns brain is in their butt so the signals can travel faster.