The most common bird on the planet is the red-billed quelea
An unfortunate consequence of human interference is that some species of animals are suffering drastically dwindling numbers. Deforestation, climate change, and overhunting have driven some animals near extinction. The red-billed quelea seems to be immune to these threats, though.
This bird species is native to sub-Saharan Africa and is considered the most common bird on Earth. They are even considered pests in many regions because they can be destructive to crops.