This was actually a propaganda poster against STD transmission. Odd that it had a dino, but the dinosaur looked too happy to be used only for those purposes so here she is in all her glory! (This image is based off elements from a US Government propaganda poster, and thus it is public domain.)
老年恐龍
ancient、animal、dino、dinosaur、eating、herbivore、river、t-shirts
古、動物、恐龍、恐龍、吃、草食動物、河、T卹
資料來源：openclipart ( https://openclipart.org/ )