This is a question that plagues the mind of many monster and cryptozoology enthusiasts. For years people have speculated and wondered what the possible creature living in the loch could be. Lets take a look at some of the caniudates.
A lake sturgeon
A popular guess is a lake sturgeon. These fish are native to the lake and can grow up to 8 feet long. This fish also matches the description of hard crocodile-like plates on the back, which is a common theme in Nessie sightings.
When trees become water logged and sinks to the bottom of the loch they can stay down at the bottom for years. When they resurface they release bubbles and then float to the top giving off the illusion of a creature coming up for air.
There have been eels known towash up on the shores of the loch and these are large enough animals(some growing up to 10 feet) to match the description of a large unknown creature swimming in the lake.
Back when circuses traveled through england circus owners would allow their elephants to swim in the loch. Elephants swim with their trunks sticking out of the water. This makes the classic swan neck shape that is common throughout nessie sightings in the water.
One of the more fun ideas about Nessie is that she is a surviving plesiosaur from the triassic era. Though if Nessie was a plesiosaur she wouldn’t be able to move her neck in the swan like fashion as plesiosaurs necks were unable to move like that.
An unknown species
The last option for Nessie is she could be an undiscovered species that has eluded people for eons. A species that has humps, crocodile like plates, a swan like neck, and can survive in the cold waters of the loch.
So what is Nessie?
She could be any of those things until we know exactly what she is or isn’t and I think that’s the fun of the Loch Nes Monster. It can be whatever you want to be and no one can tell you otherwise.