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Old 03-23-2016, 10:31 PM
Mijin Mijin is offline
Join Date: Feb 2006
Location: Shanghai
Posts: 8,060
A species heavy enough to fall and be seriously injured / die that had no appreciation of the danger of heights would not last very long.

But I doubt that they understand gravity in the sense of accelerating towards earth.

In humans for example our fear of heights is closely associated with our visual system. If the ground is far enough away that there is no noticeable parallax, or our body is rotated so that the ground is not seen by looking straight down, a lot of the fear response is diminished.
So even in humans, the instinct is not based on an awareness of gravity per se.

Last edited by Mijin; 03-23-2016 at 10:32 PM.