biology, evolution, Science, Science and society

The (evolutionary) roots of lethal human violence

How much of human violence is innate, and how much of it is shaped by our environments? Are we a uniquely violent species? These are questions philosophers and social scientists have tried to answer for centuries. Now researchers have done an evolutionary comparison – and conclude that the rate of lethal human violence is six times that of the average mammal…but about average for a great ape.

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biology, Developmental biology, evolution, Science

Meanings in a song: Australian finches tell their chicks about the world outside the egg

I had one of those “I never knew that,” moments reading a paper in Science magazine this week, but, given that the research in question managed to get published in one of the top journals in the field, neither did lots of other people. The “that” in question? That sounds can alter the development of a embryonic bird to enable it to adapt to the environment it can expect when it hatches. Continue reading

biology, evolution, Explainer

Ladies, your hips change shape with your age

I read a rather interesting paper recently looking at the development of the human female pelvis, from late fetal stages until late adulthood. (You can find the full text for free here). The paper describes itself as challenging the “obstetrical dilemma hypothesis”: this is the idea that there are conflicting demands on the human female pelvis: to efficiently walk on two legs, a narrow pelvis is better, but to have large-brained babies, and to give birth safely to them, a wide pelvis is better. What I also find interesting, however, is that it takes the subconscious assumption that a large, bony structure, such as the human pelvis, is relatively fixed in proportion once you reach adulthood: turns out that, for women at least, it’s not.

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biology, evolution, Opinion piece

No, your [insert favourite humanoid alien of choice here] isn’t a mammal

This comes under the category of “pet hate”, I have to admit, but also it’s a question of getting the science right (more on that another time). Saying such-and-such an alien species is a mammal (or, worse, a reptile, because, you know, they kind of have scaly makeup) is plain wrong. Why? Because the definition of a mammal is not the one you learnt in school. It’s not “has fur or hair, gives birth to live babies, makes breast milk”. A mammal, like any other animal, is defined not only (or even most importantly) by its physical characteristics, but by its ancestors, that is, by its evolutionary history.   Continue reading