The scene, from a mini-sheet of postage stamps featuring Australian dinosaurs shows some of the warm-blooded dinosaurs that thrived in the Dinosaur Cove area under the polar weather conditions that prevailed during the Early Cretaceous (100 - 125 million years ago). Source: http://pubs.usgs.gov/publications//text/dinosaurs.html ie USGS

(Original artwork by Peter Trusler; reproduced with permission of Australia Post. 155kB orig reduced to 97kB.