This is a short excerpt from a TED Conference presentation by Ted MacCready. He compares the total mass of all humans, domestic animals and pets to the total mass of all other vertebrates over time.
2 minutes. Link to Video
This part stuck out to me, but you should watch the whole thing. The story of how he got interested in designing the bicycle powered plane that crossed the English Channel is great. Watch the rest at TEDTalks.
