Not something new but came across this unusual dinosaur that I thought would be of interest to some of our members. Definitely not what most people think of dinosaur behavior and that includes me. Described in 2007.
Oryctodromeus cubiularis is a small Cretaceous dinosaur often known as "the burrowing dinosaur." Adult found with 2 juveniles in a burrow; other specimens have been found since in burrows Fossils are known from the middle Cretaceous Blackleaf Formation of southwestern Montana and the Wayan Formation of southeastern Idaho, USA, both of the Cenomanian, roughly 95 million years ago
https://www.nature.com/news/2007/070319/full/news070319-5.html
Paywalled paper
http://rspb.royalsocietypublishing.org/content/274/1616/1361