How does a mouse burrow in grain? - briefly
It chews a narrow opening through the grain, then uses its forelimbs and whiskers to shift individual kernels and extend the passage. The tunnel enlarges as the animal feeds, forming a concealed network of galleries.
How does a mouse burrow in grain? - in detail
Mice locate grain stores through scent, sound, and vibrational cues. Their whiskers and olfactory receptors detect the presence of kernels, prompting them to approach the surface.
When a mouse reaches the grain mass, it uses its incisors to separate individual seeds and its forepaws to push loose particles aside. The animal creates an opening by gnawing at the outer layer of the grain pile, often starting at a point where the material is less compact.
Excavation proceeds with rhythmic movements:
- Forepaws dig and pull grain away from the tunnel entrance.
- Hind limbs push the mouse backward, extending the passage.
- Incisors trim any obstructing fibers or husks.
- Tail assists in balance and helps sweep debris out of the tunnel.
The tunnel expands gradually, forming a network of chambers. Mice reinforce walls by compacting surrounding grain, which provides structural stability. Moisture from the mouse’s breath and body heat slightly dampens the grain, increasing cohesion.
Inside the burrow, mice construct storage cells. They line these chambers with shredded husks and fecal pellets, creating a dry microenvironment that deters mold growth. Food caches are arranged in layers, with larger kernels stored deeper to reduce the risk of detection by predators.
Ventilation is maintained by a series of small air shafts that connect the tunnel to the surface. These openings allow airflow, preventing the buildup of carbon dioxide and excess humidity.
Throughout the process, the mouse’s metabolism adapts to the low‑oxygen conditions within the grain mass. Elevated hemoglobin affinity for oxygen and a reduced heart rate enable sustained activity in the confined space.
The entire burrowing sequence can be completed within a few hours, depending on grain density and the mouse’s size. Continuous maintenance—removing debris, reinforcing walls, and expanding chambers—ensures the shelter remains functional for weeks.