Tortoises

An introduction to two very different types of tortoise – the jousting angulate tortoises of Dassen Island, and the giant tortoises of the Galapagos. Biology - Animal Kingdom - Learning Points. Male angulate tortoises are very territorial, and frequently joust with one another. The underside of a tortoise's shell is called the plastron. Male giant tortoises have a concave plastron, which prevents them toppling off the female during mating. Giant tortoises can live over 150 years. A Twig Context Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts in action in the real world.