Oversaturation and an aggressive use of the tone curve in lightroom are some of the possibilities.
An excellent exemplar - but yours still does not look fake as hers do. 
@Elk Here’s the same image with far more aggressive post processing.
That has a tasty not real effect.
It is missing the bitter over etch edges sort of look however. Does this result from too much sharpening?
Yes. Oversharpening does tend to create halos at the edges.
This is the effect that someone directly wants - that it should look fake … there are free photo programs where you can play with it.
Fabulous expression, and now the bear is a ham. 
I think it was eating either an apple or pear, didn’t get closed enough to be sure… 
Does a night vision Surveillance clip count as "Photography? "
“Mooommmm, Are we THERE yet…?”
“I’m Hungry…”
