The Parasaurolophus is an electronic dinosaur from the The Lost World: Jurassic Park toy line.
Sadly, in my opinion, the dinosaur has just one flaw. One of its legs sticks weirdly out to the back (not shown on the pictures) to make it look like its running. However this makes it very difficult to make it stand on its own.
By pushing the button on the back, the dinosaur will make its iconic trumpet sound and it kicks the weird standing leg forward. By playing a little bit with this, you can make the Parasaurolophus stand on its own.
Despite that one little flaw, it’s an amazing toy, although not too common outside the United States, you should find it pretty cheap on eBay (loose that is).