Credit: University of Wisconsin Oshkosh
Phys.org has a story about one the most favorite raptor dinosaurs. Raptors became popular after appearing in the 1993 blockbuster movie Jurassic Park. In that movie, where they were incorrectly called Velociraptors instead of Deinonychus antirrhopos, they are portrayed as hunting in packs similar to wolves. Because behavior doesn't fossilize, there has been little evidence for this hunting style. This study, published in the journal Palaeogeography, Palaeoclimatology, Palaeoecology, compared the composition of teeth from young and adult specimens. Teeth are a good predictor of both what and where an animal eats.
"The problem with this idea is that living dinosaurs (birds) and their relatives (crocodilians) do not usually hunt in groups and rarely ever hunt prey larger than themselves," he explained.
"Further, behavior like pack hunting does not fossilize so we can't directly test whether the animals actually worked together to hunt prey."
Recently, scientists have proposed a different model for behavior in raptors that is thought to be more like Komodo dragons or crocodiles, in which individuals may attack the same animal but cooperation is limited.
"We proposed in this study that there is a correlation between pack hunting and the diet of animals as they grow," Frederickson said.
In Komodo dragons, babies are at risk of being eaten by adults, so they take refuge in trees, where they find a wealth of food unavailable to their larger ground-dwelling parents. Animals that hunt in packs do not generally show this dietary diversity.
"If we can look at the diet of young raptors versus old raptors, we can come up with a hypothesis for whether they hunted in groups," Frederickson said.
