According to the Swedish naturalist and author Bengt Sjögren (1980), present-day lake monsters are variations of older legends of water kelpies.[2] Sjögren claims that the accounts of lake-monsters have changed during history, as do others.[3] Older reports often talk about horse-like appearances, but more modern reports often have more reptile and dinosaur-like appearances; he concludes that the legendary kelpies evolved into the present day saurian lake-monsters since the discovery of dinosaurs and giant aquatic reptiles and the popularization of them in both scientific and fictional writings and art.[2][4]