Certified GKH Gardening Expert
Other than adding some chicken wire over top of the planting area, slightly covering with soil and mulch, you may want to consider tactics that prevent these critters from coming to the area altogether. Try these articles for some helpful tips on keeping the squirrels and rabbits at bay: https://www.gardeningknowhow.com/plant-problems/pests/animals/get-rid-squirrels.htm
https://www.gardeningknowhow.com/plant-problems/pests/animals/keep-rabbits-out-of-gardens.htm
Set a trap for the rabbits and squirrels. You can buy one of those live traps off of ebay for not too much and then you can release the critters someplace with plenty of woods or whatever habitat they live in.