Understanding electric fences helps in most cases, they are often poorly erected and not used to best effect, I remember tales from a couple of kiwis that had travelled the world demonstrating electric fencing techniques , my favourite story was keeping wild elephants out of sugar plantations, aparantly only needed a single strand hot wire as nelly is very curious they would reach out and touch the hot wire with their trunk, but it didn't take long for them to learn to pull the posts out and step over..