Postcard US-2510594 to Bulgaria reached its destination in 22 days, and it was purchased at the Nevada State Museum in Las Vegas during a previous Museums on US visit. The postcard shows Ichthyosaurs, giant marine reptiles that thrived during much of the Mesozoic era more than 200 million years ago. They evolved from a group of unidentified land reptiles that moved back to the sea, in parallel to the ancestors of modern-day dolphins and whales. The official state fossil of Nevada is the Ichthyosaur.
