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Whale Tale. How we hunted the world's largest animal to the brink of extinction

Published in Norwegian by Kagge forlag, 2018. Hvaleventyret. Hvordan vi nesten utryddet det største dyret som har levd.

 
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The Secret Life of Small Birds

Published in Norwegian by Kagge forlag, 2015. New paperback edition 2018. Meisenes hemmelige liv.
Finnish edition by Atena, 2016. Tiaisten salainen elämä.
German edition by Insel Verlag, 2017. Das verborgene Leben der Meisen.

Read Kai Spanke’s review in Frankfurter Allgemeine Zeitung

 
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The Aquarium Book for Kids

Published in Norwegian by Tjern forlag, 2013. Akvarieboka for barn.