So you say you know what dinosaurs look like. You know all the superstars - the big, powerful, Jurassic Park monsters you learned about in the 90s. Take a look at the recently uncovered Bajadasaurus pronuspinax and you might well be thrown for a loop. This dinosaur doesn't look like any sort of dinosaur I knew as a kid. And why would I? All I knew (before Spielberg's blockbuster) was what I saw in books - and those dinosaurs looked a lot like lumpy hippos, really.