When Darwin Found The Giant Fossils Of Extinct Armadillos And Sloths He Saw How

When darwin found the giant fossils of extinct armadillos and sloths, he saw how similar they were to the living, smaller armadillos and sloths – and he wondered why would god create giant ones that no longer existed and later smaller ones that did – this just did not make sense to him – there must be another answer?