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Sure, why not? But rather than focusing on a t-rex-style predatory super-bird, which would be limited by the maximum size and abundance of its prey due to its obligate carnivorous lifestyle, your best bet, IMHO, would be some alternate/future evolution relative/descendant of the Hoatzin: the last surviving member of an order of birds which recent genetic ...


You're essentially asking for birds, which already came from the theropod dinosaurs and suffered heavy alterations to become lighter and more adapted for flight, to essentially re-evolve the traits they lost in order to grow. You're also asking for them to grow to the size of a T-rex when their ancestors were much smaller. Can they do it? Likely. T-rex came ...


No, because theropods use their legs and wing/hands to push up while birds can only us their legs. If the bird's wings get bigger to lift a bigger bird the legs will need to get bigger to push the bigger bird into the air. Theropods avoid that by pushing up with the winds and legs. Like bats.


This creature would likely have evolved from a creature with a large heavy tail, in order to make the central pair of limbs into the wings. It is likely that such a creature would naturally stand hexapedally, and only raising the hands to do things.


Encyclopaedia Britannica, s.v. Homing (animal behaviour): Most of the best-known examples of strong homing ability are among birds, particularly racing, or homing, pigeons. Many other birds, especially seabirds and also swallows, are known to have equal or better homing abilities. A Manx shearwater (Puffinus puffinus), transported in a closed container to a ...


I think falcons might work, they are already trained by people, so we would not have to learn how to train them.


Storks -- they are migratory and thus have good navigation, they are large enough to carry decent sized messages, they have some interesting colors ...and - as everyone knows - they already deliver babies.

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