Evolution

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In the bullfinch world, she gets to decide

A lot of birdwatchers like the bullfinch. They’ve probably noticed that the female can chase off the more colourful male from the bird feeder. That makes this species different.

Vampire bats’ bloody teamwork

Vampire bats are the only mammals that feed exclusively on blood. The way they manage to do that offers us some remarkable insights into evolution.

Is the woolly mammoth really gone for good?

Should we reintroduce animal species that have died out? New technology may offer opportunities that no one could imagine a few decades ago. But the answer may not be as simple as you think.

Why the passenger pigeon died out

The passenger pigeon was once among the most numerous species on earth. The last passenger pigeon died in the Cinncinati Zoo just over 100 years ago. How did it all go so wrong?

Brawler at the bird feeder

The common redpoll gets into brawls when it seems like it should really be watching out for enemies. How can that end well?

Stress in the nest can have lifelong effect

Why do some sparrows hatch six chicks while others don’t hatch any? How does upbringing affect the remainder of their lives? Physiological stress in the nest can actually affect birds’ DNA and possibly their lifespan.

Human Evolution in the Sea at Bioko

Did some of our human features evolve while our ancestors were living in water? The aquatic ape theory has been disregarded by paleoanthropologists, but it deserves another chance.

Avian songsters

Bird songs have many functions, but their main purpose is to attract a mate. Some of the best avian singers are described below.

One-night stand regrets

Women regret saying yes to casual sex much more often than men do. Men – almost exclusively – regret saying no. Why?

Brown trout or sea trout.
WITH VIDEO

The secret life of the sea trout

Armed with special acoustic tags, a team of researchers is following 50 individual fish for as long as seven months to learn more about their life – and death — in Norwegian fjords.