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Dinosaurs used to be the ruling animals on our planet millions of years ago. But then they all disappeared. Or maybe not?

Scientists believe that birds that live around us today come from... dinosaurs! Yes, they are much [ ] than Pterodactyls, and they don't harm people. So, can you believe that the T-Rex, which was [ ] dinosaur, is the grandpa of all parrots, pigeons and ducks? It is hard to believe, but it's true!

Modern birds come from a group of dinosaurs called theropods. Theropods which are closest to birds could be [ ] than 200 kilograms, they were as [ ] as hippos. The heaviest bird that can fly now is about 20 kilograms. Theropods had big teeth and their tails were [ ]. But as well as our birds, some theropods also had feathers. They weren't [ ] animals: some of them had a brain as big as a duck's.

With time, they became smaller and smaller, got wings and learnt to fly.