WHAT EXACTLY IS A CORVID?
A Corvids are a kind of songbird. Corvids, so the Corvidae family, includes crows, ravens, magpies, jays, rooks, jackdaws and choughs. Ravens are the biggest songbird in the world.
THEY'RE SONGBIRDS? BUT A CROW MAKES A 'CAW CAW A CAW' NOISE, WHICH SOUNDS PRETTY DIFFERENT FROM OTHER BIRDS.
"Songbird' is a little bit of a tricky name because the designation of songbird is based on both the positioning of the feet and, most importantly, the anatomy of the vocal area. And that's the feature that these birds share with birds like robins and sparrows and all that kind of thing.
Humans produce the sounds that we do using a larynx, and most birds, including songbirds, have what's called a syrinx. The anatomy does differ a little bit across groups, but the corvid syrinx is going to look pretty similar to other kinds of songbirds. The main difference, though, between crows and ravens and other types of songbirds has less to do with their anatomy and more to do with their brain. Most songbirds have a short window of time when they're young where they learn every sound that they're going to make, then that window closes, and that's it. They don't make any changes moving forward.
But one of the really interesting aspects about crows and ravens is that they can learn new sounds throughout their lives. They have really, really impressive vocal repertoires. Part of the reason that they can make such a wide variety of sounds, including human speech, is because they have independent muscle control on either side of their syrinx, so they can produce two different sounds at the same time.
IN THE UK, SOME OF OUR MOST COMMON CORVIDS ARE CROWS, ROOKS AND RAVENS, BUT PEOPLE QUITE OFTEN GET THESE CONFUSED. IS THERE A WAY YOU CAN EASILY TELL THEM APART?
Denne historien er fra March 2022-utgaven av BBC Science Focus.
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Denne historien er fra March 2022-utgaven av BBC Science Focus.
Start din 7-dagers gratis prøveperiode på Magzter GOLD for å få tilgang til tusenvis av utvalgte premiumhistorier og 9000+ magasiner og aviser.
Allerede abonnent? Logg på
COULD MARINE CLOUD BRIGHTENING HELP US FIGHT CLIMATE CHANGE?
The theory behind marine cloud brightening is that brighter or whiter clouds reflect more sunlight back into space.
IS IT SAFE TO RUN EVERY DAY, OR SHOULD I DITCH MY RUN STREAK TO SAVE MY KNEES?
A running streak, where you run every day without taking rest days, can be highly motivating and beneficial for overall fitness. Running is great cardiovascular exercise and isn't to be discouraged (and finding a routine with some consistency is great). Getting a bit of exercise as often as possible is also hugely beneficial for your mental health.
WHAT MAKES THE MEDITERRANEAN DIET SO GOOD FOR US?
The Mediterranean diet may help you live longer, especially if you also adopt the lifestyle of people living near the Med during the 1950s.
WHAT IS MEXICO'S BLUE HOLE?
The world's deepest blue hole (marine sinkhole) lies off the coast of Mexico's Yucatán Peninsula. It's at least 420m (1,378ft) deep, but explorers still haven't found its bottom.
HOW CAN I TELL IF I'VE GOT HIGH CORTISOL LEVELS?
Cortisol is a hormone produced by glands in our bodies called the adrenal glands, which sit above the kidneys. It plays a critical role in various bodily functions, including regulating metabolism, reducing inflammation and helping the body respond to stress. While essential for our health, chronic elevation of cortisol levels can lead to several issues.
THE LUNGFISH
In 1836, European scientists discovered a peculiar animal from the River Amazon that they struggled to identify. Its eel-like body was a few feet long and its air-filled lungs persuaded anatomists it must be a reptile.
ARE WE THE ONLY SPECIES TO HAVE BEEN THROUGH A STONE AGE?
The Stone Age might conjure up images of early humans, sitting around a campfire or hunting prehistoric beasts, but evidence shows that we're not the only species that has learned how to work with stone tools. Wild chimpanzees (Pan troglodytes) use stone tools to crack open nuts.
Should we scrap daylight saving time?
Most of us look forward to the extra hour we get in bed every October, but researchers argue that changing the clocks twice a year harms our health
THE INTERNET OF ANIMALS
SCIENTISTS ARE USING ELECTRONIC TAGS AND SATELLITES TO TRACK WILD ANIMALS AND CREATE A DATA NETWORK THAT COULD HELP US ADDRESS THE BIODIVERSITY CRISIS
MUSIC FOR A DISTRACTED GENERATION
The number of things competing for our attention is often overwhelming. Can dreamy soundscapes created with neuroscience help our bewildered brains to concentrate?
