It pretty weird that the character can see small critters such as squirrels and bullfrog even when they are at the outer most of his vision range. Perhaps creature’s size should determine how close the character must go before seeing said creature? So creatures with TINY size should be invisible before coming into 20 titles close to the character (a normal character can see in 60 titles radius in daylight)
My proposal for vision range:
TINY: 20 titles (squirrel, rattlesnake)
SMALL: 35 titles (weasel, dog)
MEDIUM and larger: 60 titles (zombies) Basically the same as before.
This can filter out harmless critters and make the sidebar much cleaner to look at, also more realistic. This of course should stack with traits and sight-enhancing items like the binoculars. Having visibility depends on size can create potentially interesting scenarios too, like a small but fast and dangerous critter that can only be seen when you get close enough; we can also make crawling zombies smaller (MEDIUM to SMALL) for interesting effect - sorta like a unpleasant surprise.
Finally, not related to this suggestion, but the game seems to ignore certain critters, mostly flying ones like mosquitoes dragonflies and shrews… Are there any reason for this discrimination?