American Shrew Mole

The American shrew mole (Neurotrichus gibbsii) is a fascinating creature due to its distinction as the smallest species of mole. It is the sole extant member of the genus Neurotrichus and belongs to the tribe Neurotrichini. This species is also known by other names such as Gibb's shrew mole and least shrew mole.

Physical Characteristics

The American shrew mole is diminutive in size, measuring approximately 10 centimeters (3.9 inches) in length, which includes its tail of about 3 centimeters (1.2 inches). It weighs roughly 10 grams (0.35 ounces). Its dense and soft fur ranges in color from dark gray to a sooty bluish-black, with a tail covered in scales and scattered coarse hairs. The fur not only aids in insulation but also allows it to navigate through its environment efficiently.

One of the unique features of this mole is its long, flattened snout, which is adapted for its specialized feeding habits. Unlike shrews, it possesses a zygoma and auditory bullae, structures absent in shrews but present in traditional moles. The enamel on its teeth is white, contrasting with the mahogany or reddish-brown enamel seen in shrews.

Habitat and Distribution

The American shrew mole is primarily found in North America, with its range extending along the western coast of the United States and into parts of Canada. It inhabits moist forests, often near streams, where it can burrow and forage for food.

Behavior and Diet

This mole displays behaviors akin to both moles and shrews. It is a proficient digger, creating intricate burrows but also foraging on the surface. Its diet mainly consists of small invertebrates, such as insects and worms, which it detects using its highly sensitive snout.

Evolutionary Significance

While it shares some similarities with the Asian shrew moles of the genus Uropsilus, which belong to the tribe Urotrichini, the American shrew mole has unique evolutionary adaptations that distinguish it in the animal kingdom. This distinction is evident in its anatomical features and behavioral traits.

Related Species and Taxonomy