I love Layton Lake, it's a good map with a good lineup of species, but I think it's really showing its age. I think this map needs a rework because it really does not stack up well compared to some newer maps.
First of all, backfilling. Layton is based in the Pacific Northwest, a region that has a rich variety of fauna. Common species in the region that are already in the game that I'd like to see added to Layton include:
Mountain Goat
Bighorn Sheep (could also get a model rework)
Red Fox
Raccoon
Green Winged Teal
Gadwall
Canada Goose
Mountain Lion (maybe)
Bobcat (maybe)
Along with backfills, plenty of brand new species could also be added to Layton Lake, mainly birds. Here are some I'd like to see on the map in the game:
Sooty Grouse
Ruffed Grouse (could also be added to Yukon Valley and New England Mountains)
Wood Duck (could also be added to Mississippi and New England)
Northern Pintail (also could be added to Mississippi & NEM)
Snow Goose (could also be added to Yukon Valley)
North American Beaver (can also be added to Yukon Valley, Mississippi Acres and NEM)
American Badger (could also be added to SRP)
Snowshoe Hare (could also be added to Yukon and NEM)
We could also use a rework to the animal home ranges on Layton Lakes, to make room for the new species and make the home ranges of existing species more cohesive and logical. Moose and Whitetail Deer should mostly be in the low elevation marshy/swampy areas and woodlands, Blacktail Deer and Roosevelt Elk should be in the coniferous forests and mountainous areas, and the Black Bear should be found in the densely forested areas. White Tailed Jackrabbits and Coyotes should mainly be in open grassy areas of the map. Other species' home ranges are already fine in my opinion.
One last thing: I think Layton Lake could use a slight graphical update, to bring it up to the quality we've come to expect from the more recent maps. Some more vegetation variety (especially shrubs and bushes) would also be nice.