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A Closer Look at Northern Cardinals and Their Territorial Behaviors During Breeding Season / Why Do Cardinals Attack Mirrors?

The vibrant red of the male Northern Cardinal brings a splash of color to our gardens and parks. These charming birds are not just a delight to behold; they also exhibit fascinating territorial behaviors during their breeding season that are worth exploring.

Male Northern Cardinal displaying territorial behaivor towards its reflection in a vehcile side mirror.
Male Northern Cardinal displaying territorial behaivor towards its reflection in a vehcile side mirror.

Northern Cardinals, a popular species in North America, are known for their strong sense of territory, particularly when it comes to nesting and raising their young. Males are naturally protective of their domain and will defend it vigorously against intruders. This territoriality often begins in early spring and can last until the young have fledged, which is typically in mid-summer.


During this time, you may notice the male cardinal singing loudly and proudly from high perches, marking his territory with a series of melodic calls. This song serves a dual purpose: it not only attracts a mate but also warns other males to steer clear of his space. If another male dares to venture too close, you might witness an impressive display of aggression. The male will puff up his feathers, spread his wings, and even engage in physical confrontations, showcasing his strength and determination.


One interesting aspect of their behavior during the breeding season is how male cardinals react to their reflections in windows and car mirrors. Which leads us to the answer to our question; 'Why do Cardinals attack mirrors?'...


Driven by their instinct to defend their territory, they often mistake their reflection for a rival male. This can lead to repeated and sometimes frantic attempts to chase off the “intruder,” where they peck at the glass, flutter around, and sing vigorously in an effort to assert dominance.

While this behavior can be entertaining to observe, it can also be distressing for the birds, as they may exhaust themselves in their attempts to fend off their “competitor.”


Cardinal displaying territorial behaivor towards reflection in window
Female Northern Cardinal displaying territorial behaivor towards her reflection in a window.

The female cardinal, while primarily responsible for nest building and incubation, also plays a key role in defending the territory. She may join in on the vocalizations or help chase off any unwanted visitors. Together, they create a united front, ensuring that their nesting site remains safe and secure for raising their chicks.


It's important to note that territorial behaviors can vary based on environmental factors and the availability of resources. In dense habitats, such as thick shrubs or woodlands, cardinals may establish smaller territories, while in more open areas, their territories might be larger.


So, if you're lucky enough to spot a Northern Cardinal during this time, take a moment to appreciate not only its beauty but also the intricate behaviors that come into play during the breeding season. Watching these birds as they nurture their young can be an incredibly rewarding experience—one that reminds us of the wonders of nature right in our own backyards!

🐦‍⬛💕


Julie Rabalais

Founder/Director

3337-501-4523


*This article comes to life through the author's personal insights and experiences, as well as information gathered from respected sources, all brought together to create a richer understanding of the topic.

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