Escamoles, sometimes called ant egg caviar, are a delicacy in Mexico. These ant larvae can cost over $50 per pound. And when they're exported prices can double. But finding escamoles isn't easy. Harvesters have to reach into nests with thousands of ants. Escamoles have been eaten for centuries but poaching and the climate crisis are threatening the supply. So what do these ant larvae taste like? And why are they so expensive?