"The moose do not sleep in the morning."
Translation:Älgarna sover inte på morgonen.
If it was a single moose (singular, third person), the sentence would indeed be "The moose DOES not sleep in the morning". But here we have "do" instead of "does" and it's still used with a noun in third person. This indicates we're speaking of a plural noun.
Edit: Singular - "moose", plural - "moose". They're exactly the same :)