Why are sparrows listed as endangered species?

Explanation

The extinction of the dinosaurs is an enigma that has captivated scientists for well over a century. We find the fossilized remains of gaint reptiles all over the earth. Yet we do not see any of the creatures alive today.
If sparrows are not there, the population of birds of prey may also be affected. Apart from this, every constitue of an ecosystem is important from an ant to an elephant. We are eliminating species by species which are important links which make the web of life. Today it's these species are getting extinct.