Viability of Fixed-Wing Biological Flying Creatures?

How plausible are naturally-evolved, biological, fixed-wing flying creatures? Could such a creature plausibly evolve in Earth-like conditions? If so, what method would it be most likely to use for propulsion, and how large could such a creature realistically become? If such creatures are not plausible in Earth-like conditions, how much would conditions have to change for fixed-wing creatures to become plausible?

To clarify, these creatures would have completely fixed wings. Any kind of wing that has a capability for motion does not count, even if such wings are held immobile for long periods while soaring. Propulsion cannot come from any kind of flapping motion of the wing.

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Viability of Fixed-Wing Biological Flying Creatures?

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