Over their 165 million-year reign on Earth, hundreds of billions of dinosaurs lived and died. Occasionally, they did the latter en masse, making it much easier for us to find their fossilized remains and examine them. Concentrated areas of dinosaur death have become colloquially known as "dinosaur graveyards". The following are some of the most remarkable.
1. The Hilda Mega-Bonebed. Around 75 million years ago, a herd of Centrosaurus that may have numbered in the thousands was swept up in a torrential flood that inundated the lowlands of what is now Alberta. The hapless, top-heavy dinosaurs were dragged into river channels that flowed into the shallow inland sea which cut North America in two, where they drowned and accumulated in a macabre mass. Scavengers feasted upon their fleshy remains.
