Weird pig-size animals with tusks were surviving a mass extinction, but not thriving.
About 251 million years ago, groups of pig-size herbivores with tusks and beaks huddled together, died, shriveled up and then fossilized looking like squashed roadkill, with impressions of their pebbly skin still present in the rocks around them.
"As we are observing today with global warming, it seems that [warming] increases the likelihood of extreme events," said Pia Viglietti, a postdoctoral fellow in Earth Sciences at the Field Museum of Natural History in Chicago."That may have been what was happening in the earliest Triassic, that there were these repeated drought events happening more frequently."
Dying together The fossils suggest that the young lystrosaurs may have clustered together before they died, probably on a floodplain where they had hope of finding water and vegetation. This sort of behavior is still seen today during droughts in sub-Saharan Africa, Viglietti said, where animals gather around dwindling sources of water and food before succumbing to thirst and starvation.
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