Deer Have Antlers, Walruses Have Tusks – Here’s Why So Few Birds Have Weapons of their Own. Read all about it by clicking the link below. Ducks Birds AngryBirds Discovermagazine
For the purpose of testing the fight-or-flight idea, it’s good news that some species carry weapons. This allows us to analyze our expectation that spurs should be found more often in species that depend less on flight than on those that fly frequently.
Luckily, we were able to draw on a global data set of the hand-wing index – a metric of wing shape that scientists use to quantify how well various bird species are adapted for flight and hence, presumably, how much they depend on it. This information was recently made available forOur findings showed clear connections across bird species between the presence of spurs and flight behavior. On average, species that depend more on flight have fewer or no spurs.
France Dernières Nouvelles, France Actualités
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