Death Rays
- Episode aired Feb 12, 2009
![Animal Armageddon (2009)](https://m.media-amazon.com/images/M/MV5BODkxMDkwOTE0N15BMl5BanBnXkFtZTcwMDE5NTA4Mg@@._V1_QL75_UY281_CR3,0,190,281_.jpg)
What caused the Ordovician extinction event 450 million years ago, the second-largest of the five major extinction events in Earth's history.What caused the Ordovician extinction event 450 million years ago, the second-largest of the five major extinction events in Earth's history.What caused the Ordovician extinction event 450 million years ago, the second-largest of the five major extinction events in Earth's history.