Translation:The boy finds owls and the girl finds falcons.
Your translation is fine.
Duolingo develops its correct sentence database during a beta release of the course, which is where High Valyrian is now. Users can report "My translation should have been accepted" and the volunteer course contributors can choose to accept these as alternative translations.
Thanks to it being reported "The boy finds the owls and the girl finds the falcons" was just accepted for me. Thanks!