Just before I reached the barrier fence, I found Mu Zhenxian, sitting at a low table behind her earthquake wares.

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One of the byelaws prohibits "people climbing on any wall, fence, tree, barrier, railing or structure without a reasonable excuse".

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Rancher Carol Kimsey, who lives in a valley near the Pacific Ocean on the U.S.-side of the fence, says the border barrier has improved the quality of life in the area.

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Israel has stepped up its military deployments near the border and is constructing a 240km (150-mile) double fence to act as a physical barrier.

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Work is due to start on Monday to replace nearly two miles of metal fence along Narborough Road South with a new barrier made from recycled plastic.

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However, despite physical challenges, Laurel is seen using her front flippers to hoist her large, heavy body onto the top of the barrier, before wobbling slightly and eventually toppling over the fence to the other side to meet Togo.

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