It is clever of the crows to make their nests in such tall trees.
From a BrE point of view "clever" is the colloquial term for the slightly more formal "intelligent," but the nuance is slight. In the UK you do hear "smart" to mean "clever" but it is AmE. An American would say "Lisa Simpson is smart" but an English person would say that she is "clever".
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Dear Taka,
'It is smart of X to do' means 'X had better do.'
DavkettVery interesting, Rwiles,
The briefest way for me to put how I understand AmE usage, relative to the crow-like circumstance, is:
clever = resourceful
smart = knowledgeable