* Maybe the owls are sort of the wizarding equivalent of Muggle owls (like Kneazles are the equivalent of cats) and have inherent powers?
* Maybe, in the Potterverse, all owls are just that smart and powerful, and the Muggles just haven't figured it out yet? (OK, that one's a bit of a cop-out, because you could argue 'well, it's just that way in the Potterverse' for anything)
* Maybe the owls are under the same injunctions as their owners? So if the owner was capable of going somewhere, so could their owl? Though that still doesn't explain the OOTP thing, as Harry hadn't received Dumbledore's note then. Wild guess. Perhaps owl post is just untraceable?
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* Maybe the owls are sort of the wizarding equivalent of Muggle owls (like Kneazles are the equivalent of cats) and have inherent powers?
* Maybe, in the Potterverse, all owls are just that smart and powerful, and the Muggles just haven't figured it out yet? (OK, that one's a bit of a cop-out, because you could argue 'well, it's just that way in the Potterverse' for anything)
* Maybe the owls are under the same injunctions as their owners? So if the owner was capable of going somewhere, so could their owl? Though that still doesn't explain the OOTP thing, as Harry hadn't received Dumbledore's note then. Wild guess. Perhaps owl post is just untraceable?