Rabbit, Rabbit, Rabbit

What do you call a group of rabbits?

There are several correct answers:

A bury of rabbits; A colony of rabbits;
A trace of rabbits;

A trip of rabbits; A warren of rabbits

So what brought on all this rabbit talk?  Well, for years we have always started the first day of the month by saying "Rabbit, Rabbit, Rabbit" and were told that it brings good luck for the next month.  Now, do you believe in this?  That is for you to decide, but I can tell you that my siblings still acknowledge it each month as do I.