Dung Beetle Navigation
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Black Lives Matter @GeneticJen 路 Aug 14 So today I was talking about evolution being amazing and literally every animal being awesome and I'm told the dung beetle isn't. Thread 馃憞 |
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mechanism narrative |
Black Lives Matter @GeneticJen 路 Aug 14 "It rolls poo". Yeah so lemme talk about that for a second. You can either roll poo, or you wait to ambush another beetle rolling poo |
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Black Lives Matter @GeneticJen 路 Aug 14 So if you're rolling poo, you wanna roll it the hell out of there as fast as possible in case you're going to get ambused |
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Black Lives Matter @GeneticJen 路 Aug 14 Fastest way to get somewhere? A straight line. So dung beetles push their ball in as straight line as possible. Simple, right? |
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discovery narrative |
Black Lives Matter @GeneticJen 路 Aug 14 How do dung beetles keep such a straight line? Marie Dacke, a biologist at Lund University in Sweden found they observed the sun and moon |
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Black Lives Matter @GeneticJen 路 Aug 14 During the day they watch the sun and during the night they use polarised light from the moon. This was back in 2003. Good so far https://t.co/eFBWlIGD8K
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Black Lives Matter @GeneticJen 路 Aug 14 If you put the beetle in a walled area so it can't see surroundings, it uses the moon. Takes 20 secs to get to a wall |
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Black Lives Matter @GeneticJen 路 Aug 14 Put a lid on top so it can't see the moon and now it takes 2 mins on average to hit a wall because they can't keep a straight line |
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Black Lives Matter @GeneticJen 路 Aug 14 This is what happens if you have a light source at the top turned on and then turn on the one at 90 degrees instead. It changes course https://t.co/3mpZjBvlwf
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Black Lives Matter @GeneticJen 路 Aug 14 Marie Dacke observed something weird in the following years. If the beetle can see the sky but it's a moonless night, it still does well |
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Black Lives Matter @GeneticJen 路 Aug 14 40 seconds with moonless night sky rather than expected 2 minutes. Was she wrong? Is it not really about the moon? So she studied further |
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Black Lives Matter @GeneticJen 路 Aug 14 They can't be using the stars because the beetle's eyes are too shit for that. Where you see a star they see darkness. So what gives? |
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Black Lives Matter @GeneticJen 路 Aug 14 She did things like turn only the brightest stars on, or only dimmer ones, and all sorts of weird experiments to see what the beetle did |
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Black Lives Matter @GeneticJen 路 Aug 14 Get this, the dung beetle can't see an individual star but it CAN see the Milky Way. Our spiral galaxy. It orients itself by our galaxy https://t.co/68sIhnLrtx
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payoff |
Black Lives Matter @GeneticJen 路 Aug 14 Dung beetles might be lowly, smelly, poo-pushers but hey they're the only insect we know that observes our galaxy and I think that's cool |
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Black Lives Matter @GeneticJen 路 Aug 14 We think of bio as small and astronomical objects as huge and separate but things interact even at these differences in scale https://t.co/JowHzbEXAt
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