because people keep hunting them and global warming. and people are cutting down trees and all that bad stuff for cattle and cities.
The overall population of animals on the planet Earth is not growing. Some species are increasing in population - such as H. sapiens - while many others are declining.
an animal population is group of the same species
The population of Lower Shuckburgh is 82.
The population of Lower Kabete is 69.
The population of Lower Austria is 1,612,000.
The population of Lower Kingswood is 2,511.
Lower Langford's population is 600.
Lower Heyford's population is 484.
The population of Lower Bavaria is 1,193,444.
The population of Lower Bourne is 2,256.
The population of Lower Beeding is 1,001.
The population of Lower Hardres is 557.