But mammoths and elasmo break wood.
Not if you disabled that feature.
I didn't really disabled that feature, because I didn't know how, but I have a trick to avoid large herbivore animals from breaking the walls.
I put tree leaves near the walls in a heigh the animals can't reach. Then I plant prehistoric fern under the leaves, so the animals will eat the fern when they get hungry. There is also grass and flowers in the enclosure for the animals to eat and I keep getting back there after a few days with bone meal for the grass to grow back. This also prevents the animals from getting stuck at some corner of the enclosure.
When I printed that gate, the entire enclosue was not ready yet.