McAvoy has been in New Zealand for four months shooting scenes for The Lion, The Witch and The Wardrobe.
In the movie version of the first book in the Narnia series, he plays the wily faun, Mr Tumnus.
The errant half-goat, half-man is supposed to deliver the adventurous children, who have stumbled into the fantasy land of Narnia, to the evil White Witch but decides he likes them too much to do so.
And on this rainy Tuesday morning, with his boyish frame, his tousled dark hair, a ready smile on his mildly cherubic face and the beginnings of what will eventually become a two-pronged, faun-ish ginger beard, you can just imagine this Glaswegian lad nimbly prancing on set, devouring crumpets and cracking jokes.
Luckily for him (and possibly us) his hairy legs, complete with hooves, will be computer-generated.
But before they get to see this bestial version of McAvoy in action, viewers are more likely to catch him on the big screen in a new romantic comedy, Wimbledon.
