When a deer “blows,” it produces a distinctive, often startling vocalization. This sound is a specific type of communication, a rapid, forceful expulsion of air that creates an audible signal.
The Alarm Call: Understanding the “Blow”
The “blow” is primarily an alarm or warning signal for a deer herd, alerting other deer to perceived danger. It also signals a potential predator that it has been detected, removing its element of surprise.
The sound is a loud snort, a forceful exhale through the nostrils often described as a “whoosh” or magnified sneeze. Deer can produce a single, explosive snort or a series of drawn-out “whooshes.” This vocalization is often accompanied by physical cues like foot stomping and flaring nostrils, emphasizing the deer’s agitated state.
Physiologically, the “blow” results from air forcefully expelled through the deer’s nasal passages, causing vibrations. This behavior links to the animal’s physiological response to perceived threats, as adrenaline prepares the deer for rapid flight. The sound carries effectively over distances, making it an efficient warning system.
Common Triggers for Deer Blowing
Deer typically blow when detecting something unusual or threatening. Humans are a frequent trigger, detected through sight, sound, or smell. Their highly developed sense of smell, hundreds of times better than a human’s, significantly aids in identifying threats before visual confirmation.
Other common triggers include natural predators like coyotes, bobcats, wolves, or bears. Deer may also blow if startled by unfamiliar objects or unexpected sounds.
Does, especially those with fawns, are particularly sensitive and prone to blowing as a protective measure. The vocalization is often accompanied by body language such as a tense posture, flicking tail, or direct gaze, providing additional context to the perceived threat.
What to Do When You Hear a Deer Blow
If you hear a deer blow, it indicates the animal has detected a potential threat, which could be you or something nearby. The most prudent action is to remain motionless. Freezing can prevent further alarming the animal or allow it to determine you are not a direct threat.
Observe the deer from a distance without making sudden movements. Avoid actions that might further startle the animal, as a deer exhibiting alarm signals is already on high alert. While some suggest vocalizing back, focus on respecting wildlife and not approaching an animal signaling distress.
After the deer moves on, carefully scan your surroundings, as its alarm could have been triggered by something else, like a predator. Maintaining good scent control in deer areas can also reduce the likelihood of detection and causing an alarm.