A future for trumpeter swans
In just 25 years the trumpeter swan population has gone from zero to over 800 and is steadily increasing.
Looking at animals (at the population level)
A veterinary epidemiologist is a vet who focuses on the health of animal populations.
What sounds do cheetahs make?
From chirps to purrs, growls to yelps, cheetahs are quite vocal members of the big cat family.