Don’t mess with my territory. Male northern parulas sing and get physically aggressive when intruders invade their space. Pranav Gokhale April 22, 2026 It’s a sing‑off! Myth‑busting about birds and sex when it comes to defending the nest Benjamin Freeman, Georgia Institute of Technology and Shreyas Arashanapalli, Georgia Institute of Technology Males aren’t the only angry birds defending their territory. A clever test finds which songbirds step up to fight off intruders and the role monogamy plays.
