Funny sign

Thanksgiving Point is an attraction out here that has a farm, a dinosaur museum, shopping area, fancy restaurant, golfing, a children's discovery garden, and another beautiful garden where they have a tulip festival every year. Well the two garden's are surrounded by large fences and have gates that I assume get closed at night. Well on one of the gates is this sign

The first time I saw this sign I really laughed. I was wondering who they were posting the sign for, those people who had pet deer and liked to take them on outings, or those deer who can interpret signs.