Ple-Sen
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The necessary sacrifice to fit such a long film into the allotted screen time, and these characters are not essential.
And there were pigeons in the original book, what do additions have to do with it?
Well, what else can you expect from an inferior race making a film about Noble Elves? They won't even find suitable actors!
Anyways, as an adaptation, it's good, much, much better than Potter, which is why it serves as a good example.