Here is a chicken that due to a mutation got 4 legs:
I wonder, are there examples, where such one-time dramatic mutational chages gave rise to a new species?
Are there species that appeared not due to gradual mutations, but something like this?
A new instance or pair of organs appear, such as an extra pair of limbs.
An organ reverts to its function in distant acestors (like wings to legs or legs to fins), using already existing genetic code (e.g, not like in penguins or dolphins, gradually but abruptly).
A long-lost organ re-appears (like tail)