BBC_Earth_UK_-_January_2017

What

on ear t h?

146 / / JANUARY 2017

What on earth?
January

teaser showed December’s

a barn owl’s feathers

In last

month’s

issue

Photographs: iStock

Animal, vegetable or mineral? This one’s hard to call. Is it a

cross-section of geological impurities, polished to perfection?

Or are these rings for the dendrochronologists among you?

Perhaps we need to look closer to home... We’ll reveal the

answer and pose another puzzler in next month’s issue.