if you pay attention in the tail video,especially the last part, you can notice that the water that gets splashed does not affect the water when it
comes back down....fake
I think that the first video shows an actual animal as far as I can tell. The movements that the creature makes when it flaps its tail seems very
natural.
The second video I don't trust though because the creature in the beginning seems to be CGI. Its colors don't mesh with the other colors in the
video. Also when it pops up and down in the water there is no visible water disturbance. That discredits the remainder of the second video for me at
least.
Well my friend, looks like you've stumbled upon something truly amazing here. Pardon the rambling but I have to say it. It looks like you've found
the Gyarados. Perhaps a shiny one. Watch out for that "Tail Whip" my dude. Lol. Just messin'. But, seriously though. Nice work.