original_query: What did the researchers discover about the nesting habits of hadrosaurs?
query: What did researchers discover about the nesting habits of hadrosaurs?
answer: Researchers initially believed hadrosaurs didn't nest in lowland areas or that the soil was too acidic to preserve eggs. However, later discoveries of eggs, embryos, and hatchlings in low-lying coastal plains contradicted these hypotheses.  Additionally, it was found that Maiasaura cared for their young for an extended period after hatching.