Acorns are a prime food for deer in the early season, especially in areas that lack agriculture. If you can find an oak tree like this one, you are sure to see some deer! Key features you need to pay attention to are the fact that the bits of acorn shell are scattered all around, and that there are hardly any untouched acorns still present. This tells me that the deer are eating them almost as fast as they fall. The one thing I don't see here that I would like is some droppings, but given how early it is in the season and the fact that it's a flood zone, it's not surprising that it would lack droppings.