I do love this sentence. I wonder that else it could be..
It could be Tiktaalik. Tiktaalik is an animal that had some resemblance to a fish and some resemblance to a reptile.
Maybe it's a mermaid
then what is it?
Yeah, what is it then?!
A twig under the water? Imagine that you are fishing.
Why is it den here as opposed to det?
'den' agrees with 'fisk', which is an en noun.
I think it should be "det er", because you say "det er en fisk" and "den" would not be used there.
Welp i'm danish and i can tell you that, this is just how it is...
Er der ikke en regel for det?
I just remembered that you also can use "det er"
But it may be a bear that drinks beer.
When they're being honest at questionable sushi restaurants
Possibly a green elephant--haven't my glasses on.