Today – 4/05 Critter in the News Theropod tree theropod metabolism Little Das’ Hunt.

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Presentation transcript:

Today – 4/05 Critter in the News Theropod tree theropod metabolism Little Das’ Hunt

Last time Troodon nesting behavior Evolution of flight Early gliders Oviraptor, Gallimimus, and T. rex

Volaticotherium – gliding mammal About 2.5 oz, 5 inches long, older than 125 Ma, large furry gliding membrane! Gliding is thought to have arisen 7 times in mammals (more to come!) Teeth highly specialized for insectivory Previous oldest flying mammal – 51 Ma bat

Predator / prey ratios Cold-blooded predators need less food, and so ecosystems can support more of them 1% of biomass is predators in mammals 25% in modern ecosystems with cold- blooded predators Bones say 3-5% in dinosaurs Footprints say 15%

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