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And he also explores other topics like rhino poaching in South Africa and illegal gold mining in Colombia.

Carbon, he notes, is after all the building block of life, the animating force behind trees, rhinos, eyelashes, hormones, bamboo, and so much more.

He said he was unaware of any bogus claims of medicinal value for sea lion body parts, as is sometimes noted for rhino horns or donkey skins.

“It’s so much bigger than somebody taking a horn off a rhino,” the director says.

Two rhinos – Astrid and her son Tayo – were sparring with one another, described by the zoo as "regular and natural behaviour" for the species.