These bunnies and carrots can be used in a multitude of ways at many different levels. Here are just a few suggestions:
Ordering bunnies in number order.
Odd bunnies and even bunnies.
Addition doubles -- matching carrots to bunnies.
Doubles plus one -- matching carrots to bunnies.
Placing carrots on the odd or even mats based on their sums.
How many more ways can you think of?