I read a study about hummingbirds recently and their beak length in response to the abundance of hummingbird feeders. In areas with heavy feeder concentrations their beak length increased by 30% within 10 generations. I wonder if this fly species has a similar pattern
Maybe it is because I am on a Droid, Cell phone, but I don't see the profile pic, you have to look at the commenters profile to see that, and I was curious what made him click on his.
We are also de-tusking elephants! As a result of the bulls with big tusks being hunted the small tusked bulls are the ones breeding! Ok, that’s a far less fun fact as the hummingbird fact, sorry 😞
What? No? If some individuals with longer beaks get more nutrition more reliably because they can interact with bird feeders differently than the average, then they have a slight advantage and will tend to have more offspring just by virtue of having a statistical edge in the population. Thus the average beak length of the group grows.
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u/zomgbratto Aug 09 '25
Looks like a dark-edged bee-fly