In this installment of Sasquatch Tracks, we catch up with primatologist Esteban Sarmiento, an expert in hominid evolution and researcher renowned for his interest in the speculative side of vertebrate zoology, particularly when it comes to Sasquatch.

Sarmiento is a primatologist and vertebrate zoologist whose main area of focus involves the skeletons of both extinct and living hominoids. He heads The Human Evolution Foundation, whose main goal is to understand humanity's place in nature and fight to end racial discrimination at Public Universities. However, Sarmiento is also renowned for being one of the few primatologists who has been willing to look at the question of relict hominoids.

Stories and other links discussed in this episode:

• How a National Aviary researcher's 5-year slog proved ivory-billed woodpeckers aren't extinct
• Cat's out of the bag: DNA test confirms 'big cats are on the prowl' in the British countryside
• Chimpanzee 'language' deciphered by scientists
• Orcas have sunk 3 boats in Europe and appear to be teaching others to do the same. But why?

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