Researchers are trying to understand why some wild species do better than others over time, as the environment changes.

The simple sparrow, which moves about our houses with its cheerful hopping and chirping in the mornings, has been a symbol of peace in our daily lives. But with the last few decades gone by, the ...

The house sparrow is about 15 centimeters long and weighs about 25–35 grams. It has brown and black striped upperparts and gray undersides. The male has a black throat patch and gray skullcap, while ...