How clever can an animal really be? Does true intelligence exist in the animal kingdom?

From tool-wielding apes to trap-building spiders, discover the shocking and complex intelligence on show in the natural world. Whether using rocks as hammers, water drops as bullets or plastic to attract a mate, or building immense, sophisticated towers and tunnel systems, witness the most astounding behaviours demonstrated by animals from across the world.

This is a global tour of the most surprising ways animals put their brains and genes into action to navigate evolution's challenges as we answer the ultimate question: are animals operating on pure instinct or are they actually smarter than we think?