Shelled
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Rhinos are evolving smaller horns in response to poaching
In the 2006 animated feature film Over the Hedge, we see what happens — albeit through a fantastical lens — when wild animals are pushed into close proximity with humans. As humanity continues its encroachment on the natural world, transforming wild habitats into homogenized human settlements...www.syfy.com
There are examples where Rhinoceros have "evolved" in the past 10 years (yes, only 10 years) to have no horn. Not smaller... NO HORN.
Look, the established timeline of evolution is completely wrong and if organisms can breed then they are the same "kind". The fact that traits can affect change in 100 years even means that the falsely established timeline is mathematical folly.
I'd be very interested in a source which claims and shows rhinos with no horns.
You see in elephant populations that under poaching pressure the proportion of elephants without tusks increases, but that hasn't so much to do with evolution, but more with them not being shot, so their share of the total population increases.