That's all fine and dandy... but neither will approach the airspeed is of a swallow carrying a coconut
I think Arthur et al. (1975) show that at least two swallows will be required.
Do the experts here think the overall land speed of the unicorn will match or at least come close to that of the dodo?
What do you mean by overall land speed?
No offense to Drizzzt's excellent deductions, but if we are talking about also running over terrain that horses (uh- unicorns) cannot tread easily, like swamps, that will severely alter results.
By the way, thanks to Drizzzt for clearing up the issue about the dodo's speed. I had maligned the dead guy in an earlier post ("1/125 isn't enough to shoot a dodo with the 135L, let alone a hummingbird").