QuoteOriginally posted by: ppauperhave they said "mermaids don't exist" or rather there is no evidence that they exist ?"Proofs" of the non-existence of large potentially mythical beasts (mermaids, yeti, Loch Less monsters, etc.) are usually based on the density of credible observations, minimum breeding populations, the biophysics of such beasts (e.g., sizes of required feeding areas, rate of surfacing for air, etc.), and the inevitable artifacts (carcasses, feces, bones, etc.) that these animals would produce. There are certainly plenty of unknown beasties on the planet that have evaded the eyes of scientists, but larger creatures are not so easy to hide.That said, any scientist that says "X don't exist" as a 100% certainty should probably be stripped of their PhD and tenure and sent to some mushy-headed theology school.