Observing squirrels licking brick surfaces can be perplexing. While these rodents often gnaw on various objects, licking masonry is driven by specific biological needs. Understanding these reasons offers insight into their adaptive strategies.
The Quest for Minerals
A primary reason squirrels lick bricks is to acquire essential minerals that may be lacking in their regular diet. Their typical diet of nuts, seeds, and fruits often provides insufficient amounts of certain vital nutrients. For instance, sodium is a key mineral squirrels seek, and it is frequently present in the mortar used between bricks. Beyond sodium, bricks and mortar can contain other trace minerals such as calcium, iron, and potassium, which are all important for squirrel health.
Calcium is especially important for bone density, nerve function, and preventing metabolic bone disease. Iron plays a role in blood production, while other minerals contribute to overall physiological processes. When squirrels do not obtain enough of these elements from their natural food sources, they instinctively seek them from alternative environmental sources like masonry. This behavior supplements their nutritional intake.
A Source of Hydration
Bricks and mortar absorb and retain moisture from the environment. After rainfall, during heavy dew, or in damp conditions, these surfaces become saturated with water. Squirrels may lick these wet surfaces for supplemental hydration.
This behavior is particularly observed during dry spells when natural water sources like puddles, streams, or dew on leaves become scarce. While not their primary water source, moisture on bricks offers a convenient option for squirrels to quench their thirst. It acts as an opportunistic way to maintain hydration when other options are limited.
Assessing the Impact
The act of squirrels licking bricks is generally harmless to the animals. It is a natural instinct for them to supplement their diet and hydration. This behavior is driven by their biological needs, ensuring they receive necessary minerals and water.
The impact on the structural integrity of buildings is typically negligible. The amount of material removed by a squirrel licking a brick or mortar surface is usually very small. While repeated licking over extended periods might cause minor surface erosion, it is unlikely to lead to significant structural damage to well-maintained bricks or mortar. This behavior is a common, adaptive action for squirrels, driven by their search for specific resources.