Locks and gates only keep an honest man honest.
Wildlife Friendly Fence But Deters Human Trespassing? - Page 2
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The best wildlife-friendly fencing, by far, that I have come across is hawthorn hedgerows. I live in the UK and all throughout the countryside, you will see hedgerows that start off as hawthorn-only, but gradually, as years go by and birds visit them, other species appear, such as hazel, oak, elder, blackthorn, etc and bramble along the bottom. Not only would such a thick, thorny hedge stop humans (I can assure you you'd need two ladders to get over mine) and let animals through, but it would also provide you with fresh, wild fruit.