That artwork is created for exactly the same reason as humans create artwork
How do you know?
I think it’s fairly obvious that the artwork was created because it is considered to be aesthetically pleasing – to include the rest of my edited sentence.
Otherwise it would fail in its intended purpose, ie, to be aesthetically pleasing.
In the examples above there is a huge amount of individual creativity.
Of course you’re free to disagree. Perhaps like Fredrick Engels you think it isn’t even art 🙂
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I would have assumed the primary reason for animal artwork is to impress a potential mate with a view to getting a quick leg trembler.
And I think you also need to assume that the female bower bird appreciates art, and is in fact quite fussy. Incredibly fussy by all accounts.
Talent is a fanny magnet, eh?
EDIT : Anyway, which is your favourite? I think mine is the subtle contrast between the grey pebbles and the white shells and bones – the contrast in colours and the contrast in organic and inorganic. Although the blue straws and bottle tops score highly for creativity and going beyond the normal parameters imo.