Adults have characteristic red cap or “poll.” Polytypic. Length 5.3". The common is generally a relatively small, streaked finch with a ... the differences in bill size and shape, the presence ...

Both species have stunning red and brown plumage which means that ... One of the differences between house finches and purple ...

A medium-size passerine with a sharply pointed ... One of the most abundant birds in North America, the red-winged’s count was estimated at 190 million in the mid-1970s. Populations are stable.

How do you know that finches' beak depth is heritable? You can see from Figure 2 that there is a correlation between the parents' and offsprings' beak size. How did the finch population change ...

The medium ground finch has a stubby beak and eats mostly seeds. Medium ground finches are variable in size and shape, which makes them a good subject for a study of evolution. The first event ...