BBC - David Attenborough's Natural Curiosities Series 4 (2018) Part 4 Curious Counters

David Attenborough's Natural Curiosities Series 4

Sir David Attenborough examines the mysteries behind some of nature's most fascinating creatures and plants.

Part 4 Curious Counters

Can animals count? This is a question that has intrigued and fooled investigators for a long time. Just over 100 years ago, a German horse called Hans was declared a mathematical genius but all was not as it seemed. And strangely, some bamboos around the world flower exactly at the same no matter where they are. Are they counting down the years?

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