Of all the animals to be immortalised by cartoons, there are few less fluffy and endearing than the pigeon. Valiant, a cheap but occasionally charming CGI cartoon, takes one such scrawny-toed birdbrain (voiced by Ewan McGregor) and turns him into a hero of World War II. It sounds like a pretty far-fetched idea - until you remember that the British military actually gave medals for bravery to carrier pigeons.
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