I thought I had read something about this, but I can't find a source, so take this with some salt.
Even big cats chitter, and while sometimes there's a social aspect where other cats are alerted to the hunt, not all big cats hunt in groups. So I think they chitter to warm their jaws up. Like streatching before exercising, or the jitters you get from adrenaline, the rapid movements ensure they can bite at maximum strength quickly, and without pulling a muscle.
Crackly blue is water? I'd even think ice before water.
Technically, this is processed cake. Yellow cake that is.
That's amazing, I love it.
As a Canadian, I share your confusion. I think that phrase was just a common descriptor of mitochondria in US textbooks, or a catchy line in a popular US biology video.
It's just strange enough to make a big impression on bored students, so I'm not surprised it's been memed so hard.
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.
Evolution is just the change in allele frequency of a population over generations. This includes 90% of the population dying before they figure out new food.
Polio would be really bad. I shudder to think about scarlet fever.
Cats were originally used for their curiosity, but training hamsters and eventually parakeets led to much smaller machines.
Capital gains tax or Land Value Tax would be more interesting.
By that argument, most of these should be black.
Do the new models even have non-"smart" fittings? I thought all the electronic chip plants closed during covid.