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Cake day: June 4th, 2023

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  • This isn’t learned behaviour though. The kites tried eating the invasive snails immediately, but they were too large to be cracked by their beaks, being two to five times larger.

    The change to eating the larger non-native snails was facilitated by larger beaks seen in the years after the invasion.

    It seems like the local applesnail had a crash due to drought in the early 2000’s (partly caused by the draining of wetlands for development), and the invasive island applesnail was first seen in 2004. There are even more species of invasive snail now, but the opportunity likely arose because of a population crash.

    The fittest in this case are the kits that can eat the snails they find, not by being less picky, but by having larger beaks.





  • Selecting one wavelength are discarding all the others, and sometimes shifting that wavelength to a more convenient hue is great for science, but feels like cheating when looking for a specific colour.

    It’s like looking for pictures of red cars, and getting a car that’s 90% rust, a picture taken in a forest fire, and a picture taken through red-tinted glass.


  • There’s the bias between users willing to share that data and those not willing. All sorts of correlations could be hiding there.

    I can’t find out what the rate of refusals are, but I’d guess them to be rather low, maybe 10% at most. The survey is incredibly easy to perform and very transparent about colleted data.

    The important thing to realise is that the survey is very consistent, so while the baseline may have some bias, the trends are very representative.




  • Tlaloc_Temporal@lemmy.catoScience Memes@mander.xyz(゜O゜;
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    24 days ago

    Or just that it needs to focus on from of itself like filter crabs, or that it needs to see through things like kelp forests or hole enterances.

    Given it’s size and the extreme binocular vision, it’s unlikely to have any ambush predators.

    I looked it up, it has bony plates all over it’s body and likely a lateral line, so seeing predators directly may have been less necessary. It was also a suction feeder, so likely an active predator of much smaller things. It may have needed good forward vision because it’s maneuverability was poor.




  • Well, not quite. Rust eats into iron because oxidised iron is larger and much more brittle than unoxidised iron, physically ripping itself out of place.

    Many oxides arent that much larger than their base metals and form a nice patina protecting the metal underneath, like in aluminium.

    Other oxides destroy the structural integrity of the metal and eat into it, forming corrosion. Rust is just corrosion specific to iron.









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