How can you tell the difference between the breeded ones vs the mutated ones?
The one's that had their tails cut off has a straight line and a gap where the tail used to be. The one's that are natural mutations has a body that meets neatly where the tail should be, like the top of a heart shape. Hope that makes sense?
Tail-less parrots are NOT a mutation. They have their tails cut off at about 1.5" in size. If it was common for this mutation then you would see plenty of other species with no tails(convicts, goldfish, livebeares) but the ones usually sold are parrots, flowerhorns, red texas, red devils and very rarely dicus. Mostly fad hybrid fish that get dyed etc. Fish are sometimes born without tails but as a tiny fry they dont last long very few fry with any deformities survive even with human help. As for being able to tell which is natural or chopped well thats crap too. I had a young convict that lost its tail due to an attack then subsequent infection. The body healed perfectly and did not leave a gap where the tail should have been. Look at a tank full of tailless parrots and you will see there quite a variation on how their bodies have healed.
Here is an article which features a part on how to amputate a fishes tail.
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