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I was not able to find the precise definitions of “true flight“, “sustained flight“ and “gliding“, that are often used on Wikipedia. My layman's understanding is that true flight is the same as “powered flight” and means the animal can utilise muscles to generate life force that exceeds its weight under a wide range of air flow conditions. That is, it does not need upward air currents such as thermals
By contrast, gliding is defined here as:
falling at an angle less than 45° from the horizontal with lift from adapted aerofoil membranes
You are welcome to suggest more correct definitions.
Can any animal that glides but is incapable of true flight (of course hawks may glide) descend upon its prey?
I am aware of this question not being very well defined, since animals such as sugar gliders can jump on their prey and perhaps utilise a tiny amount of lift to prolong their jump. It is difficult to rigorously separate this from gliding. Let's require that the animal glides a distance more than 10 times its length from a height more than 10 times its height.
Don't count because they are capable of powered flight. But they can do it.
Can “leap out to catch flying insects“ (source), but that's all I found.
“harvest fruits, nuts, fungi, and birds' eggs”(source), so they may not even prey.
Appear to be strictly vegetarian (source).