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Fossils
The Jurassic fossil was discovered on private Colorado land in 2022 and had an estimated value of between $4 million and $6 million.
The predator, which was larger than a person, likely used its wide, flat head and front teeth to suck in and chomp unsuspecting prey, researchers said.
The 6-foot-long pliosaur skull was discovered after pieces of it started to fall from an English cliff onto a beach.
The finding upends what many archaeologists thought they knew about when our ancestors arrived in the New World.
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The Nebraska man said he initially believed the underwater find was the skeleton of a catfish or deer.
The eggs and fossilized bones are the oldest known evidence of "complex social behavior" among dinosaurs, according to scientists.
Researchers named the now-extinct creature "Phiomectus anubis" after Anubis, the Egyptian god of death.
Researchers also found burned bones and carved stones.
Llukalkan aliocranianus appears to have been a top predator in its time, with hearing capabilities potentially exceeding those of similar dinosaurs.