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![Artist's rendition of the Ediacaran and our hypothesis](https://media.cnn.com/api/v1/images/stellar/prod/4467-tardunofauna-v2-copy.jpg?c=16x9&q=h_270,w_480,c_fill)
Over 500 million years ago, weird complex creatures emerged on Earth. Scientists now think they know why
![Fossil named 'Attenborough’s strange bird' was the first in its kind without teeth](https://media.cnn.com/api/v1/images/stellar/prod/ville-sinkkonen-1.png?c=16x9&q=h_270,w_480,c_fill)
‘Strange bird’ specimen might have looked like any other bird 120 million years ago — until it opened its mouth
![SP-Mammoth_03_202401091326_3000.jpg](https://media.cnn.com/api/v1/images/stellar/prod/sp-mammoth-03-202401091326-3000.jpg?c=16x9&q=h_270,w_480,c_fill)
A 14,000-year-old tusk offers clues about the relationship between early Alaskans and woolly mammoths