Trailer: Why were some dinosaurs so big?
What was the largest dinosaur? And how did it get so big? If you're shouting 'Diplodocus!' and 'Brachiosaurus!', you're on the right track.
Sauropods such as these were enormous. But the true champions were the titanosaurs, the last-surviving group of long-necked sauropods.
Tune in on the 23 February 15.00 GMT to watch our animation to find out how these dinosaurs were able to grow so big and what this meant for their survival.
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