Unser for males and Unsere for femals and plural?
Pretty much. At least, if you want to use the nominative case.
Male Unser Vogel
Female Unsere Katze
Neutral Unser Kind
should summarize it?
When do you use "unsere" and when "unser"?
It depends on the gender of the subject: "unser" for masculine and neutral and "unsere" for feminine and plural. In the nominative case, of course.
Thank you! (=
Why is 'our birds swim' incorrect?
"Our birds swim" would be "Unsere Vögel schwimmen"
^.^ I see thank you!
Not multiple birds