I am curious why they have misspelled the Mastodon? In many languages it is written and spelled in the same way. I am not native speaker but I would pronounce mastadon and mastodon in the same way (ˈmæstədɑn), but hardly I can imagine to write down as mastadon.
> First attested 1813, from the New Latin genus name Mastodon (1806), coined by French naturalist Georges Cuvier, from Ancient Greek μαστός (mastós, “breast”) + ὀδούς (odoús, “tooth”), from the similarity of the mammilloid projections on the crowns of the extinct mammal's molars.