Ornithology

No-one has seen the Yellow-crested Helmetshrike for about 20 years. That changed when researchers embarked on a six-week expedition in the Democratic Republic of the Congo and captured the dramatic-looking yellow-topped bird in its first-known photo.

Casual bird buddies and ornithology obsessives alike can now trek to far corners of the globe and identify any feathered friend they find – as long as they have their phone with them. What's more, the Merlin app can now identify nearly every species.

Thirty years of studying American cliff swallow populations has discovered a subtle but telling evolutionary influence exerted by traffic on these birds.