|Death of a Dynasty|
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Spirits of the Ice Forest
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The Ballad of Big Al
This episode starts several months before the extinction of the dinosaurs. According to the companion book of the TV series, the late Cretaceous forests were shrinking and the Pierre Seaway between Laramidia and Appalachia was slowly drying up from the north southwards. This caused avalanches and volcanic eruptions, which further deteriorate the living conditions, and destroy further the dinosaurs habitat. The mammals (exemplified by the Didelphodon) are thriving, however, sometimes at the dinosaurs expense.
The main focus of this episode is on a female Tyrannosaurus, who abandons her initial nest because all the eggs in it were still-born. This plight of hers is a metaphoric stand-in for the whole dinosaur extinction, for their 'dynasty' dies-out alongside hers. (Another symbol of the death is the giant pterosaur Quetzalcoatlus, which is the last of his kind and after its disappearance, the skies will belong only to the birds.
The female T. rex mates and nests again, lays 12 eggs, of which 3 hatch. One of the babies disappears, most likely eaten by the other two. The mother is wounded by a blow from an Ankylosaurus' tail-club and dies later of internal injuries and a broken femur. Her babies die when the dinosaurs become extinct by the Cretaceous-Tertiary extinction event, which, in the series is caused by a gigantic meteor that collides with earth in the Gulf of Mexico. The episode ends in a time-progression sequence (that mirrors the one in the first episode) that culminates in live-action shots of modern animals - and birds that are the last branch of the dinosaur family. As the birds fly off, we hear a Tyrannosaurus's roar for the last time.