libgdx How to make multiple enemy arrays? >>Any Help<<

Hey everyone,
I have been given an idea from a friend.
This is what i want to do.

6 birds flying across from left to right of the screen like a one in front of the other and each a little lower than the other.
like ducks flying.
How can i make that as an array and make it repeat every 1 minute (60 seconds) or even a delay?
Any help will be good.

Thank you
shadowMoses