>>96479662
I would count creatures with long extremities as occupying only the "footprint" of their space, unless they were low to the ground like an alligator or such, in which case the entire 'shadow' would be counted for the silhouette. Dinosaurs, for instance, are generally tall enough that one could occupy the same hex as a Brachiosaur's neck without even being able to reach it.
>>96480513
They're no more susceptible than usual senses, but you could add that as a -10% Limitation to Enhanced sensory advantages, in theory.