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From KQED in San Francisco, I'm Alexis Madrigal.

The world is a hard place to understand and navigate a problem that all animals encounter.

What is to be done? Is this good to eat? Where is the sun?

In a fascinating new book, Sentient, nature filmmaker Jackie Higgins explores how animals figure out the world around themselves

and what their remarkable sensory capacities say about our own senses.

We'll talk about the groundbreaking scientific experiments

that taught us to understand our sense of balance,

appreciate our remarkable eyesight,

and discover our circadian rhythms.

That's all coming up next after this news. Welcome to Forum. I'm Alexis Madrigal. You probably remember from school the familiar five senses, sight, sound, smell, taste, touch. But filmmaker Jackie Higgins' new book, Sension, how animals illuminate the wonder of our human senses vastly expands that censorium.

Humans both have more senses than we commonly think about, consider proprioception or our sense of our bodies,

and animals have different capabilities that give them wildly different ways of making sense of their environments.

...