Original sentence: Before the arrival of the aborigines, Tenerife and the Canaries were inhabited by endemic animals, most extinct eg, giant lizards (Lacerta goliath and Lacerta maxima), or the giant rat (Canariomys bravoi)
Edited sentence: Before the arrival of the aborigines, Tenerife and the Canaries were inhabited by prehistoric animals endemic, most extinct eg, giant lizards (Lacerta goliath and Lacerta maxima), or the giant rat (Canariomys bravoi)