Study of bird migration tricky due to hybridization

(Estonian Research Council) Hybridization, the inter-breeding of bird species, is a widespread phenomenon, which is best illustrated in Estonia by the lesser spotted eagle and the greater spotted eagle. However, due to the fact that the migration strategies of both bird species are completely different, studying their offspring, or hybrids, helps ornithologists discover a lot about their migration secrets.
Source: EurekAlert! - Biology - Category: Biology Source Type: news