Robert's multiplied highlights layer
* go to channels palette
* select highlights in RGB by clicking on circle icon at the bottom of the palette
* make a layer from that selection
* change blending mode to "multiply" and adjust opacity to between 20-50% to taste (I chose 50%)
You could also go back to the RAW file to get the grass right and export to build a layer file too perhaps?
What I am hoping to see Jamie at some point in time are some shots where the bears are just in a sea of grass & flowers are 'peppering' it with colour with just the head visible

Also where the subject is smaller in the frame and a wider expanse of location, just a thought.
cheers
Steve