Ruhani is right about the Loch. If there were underwater tunnels, it would be obvious, especially if they were large enough to allow an animal of such size to pass easily through.
Also, the anatomy of the plesiosaur is pretty much key evidence that one couldn't live in the loch.
To counter your argument against the babies being the size of a human hand? Plesiosaurs most likely had live young, meaning that these young were probably quite a bit larger than you're thinking they are.
I am talking about pymgy plesiosaurs, as they wouldn't be the same size they were millions of years ago, they would have evolved into smalled creatures. And then, there would have to be more than just a few plessies, like Saladin said, to keep the population up and, although the Loch Ness is large, it is not large enough and does not provide enough food to support plessies,
While this was a good point a few decades ago, we now know that the Loch has more than enough fish to support up to 300 normal sized plesiosaurs. or keep them from attacking each other during things like territorial disputes, which would probably happen between them, them being as large as they are.
Well, we have never been able to examine them, so this is merely a theory. Loch Ness also has a high peat content. Visibility in its water is very poor, and that would mean th plessies'd have to have some sort of sonar/echolocation sort of things, and their bodies don't provide evidence of that at all.
The bodies of their million year old ancestors, you mean. In relation to that, if plessies did live in the Loch Ness, the sonar conducted in it wouldn't really affect them. Not to mention if there were underwater tunnels, if, like Ruhani said, they hadn't caused the lake to drain at least a little, they would have at least been picked up by radar/sonar, don't you figure?
Then, it couldn't support them very well because they were reptiles- it doesn't seem the loch is warm enough these days to keep the plessies at a good temperature. Same with deep waters. They're too cold and too dark for plessies.
Also, the fact that some plessie skulls have holes in the top means absolutely nothing. Alligator skulls have holes at the top, and so do snakes'. They do not have blow holes. There isn't enough room in their heads for one, and have you ever seen any animal with a blow hole in its head like that?
In regards to any of the "Nessie" photos? The ones you claim could have real couldn't have been, simply because of the vertical neck. True, it is very serpentine, but the backbone was really rigid, and the neck couldn't raise up at that angle.
Not to sound crude, but how would you know how high an evolved pygmy plesiosaurs neck raises?Also, bored of thinking up responses. Needless to say, plessies don't live in the Loch Ness these days. Or, you know, at all.
I need to look into that underwater tunnel thing more, I'm pretty sure there is evidence to support it.[/quote]