100 under 100: the race to save the world's rarest living things

Pt. 1. Trouble with the numbers: under 100

Our closest kin: mammals

Fraying feathers: birds

Ravaged and rare: reptiles

Ambushed: amphibians

Troubled waters: fish

Unexpected endangerment: insects

Lost from the forest: trees and other plants

pt. 2. Living by the grace of humanity: gone from the wild but not extinct

pt. 3. Comebacks: under 100 and back again

Epilogue.