Animal Age

How old does a Keen’s myotis get? (age expectancy)

What is the maximal age a Keen’s myotis reaches?

An adult Keen’s myotis (Myotis keenii) usually gets as old as 18.5 years.

When born, they weight 2 grams (0 lbs) and measure 2.9 cm (0′ 2″). As a member of the Vespertilionidae family (genus: Myotis), a Keen’s myotis gets offspring up to 1 times per year. Fully grown, they reach a bodylength of 4.4 cm (0′ 2″).

As a reference: Usually, humans get as old as 100 years, with the average being around 75 years. After being carried in the belly of their mother for 280 days (40 weeks), they grow to an average size of 1.65m (5′ 5″) and weight in at 62 kg (137 lbs), which is obviously highly individual.

A Keen's myotis gets as old as 18.5 years

Keen’s myotis (Myotis keenii) is a species of vesper bat. It is found in British Columbia in Canada and in Washington and Alaska in the United States. It is named after the Rev. John Henry Keen, who collected the specimen that formed the basis for the first scientific description of the species. Classification for Keen’s myotis formerly included the Northern long-eared Myotis (Myotis septentrionalis), resulting in older studies confusing the species for one another.

Animals of the same family as a Keen’s myotis

Not really brothers and sisters, but from the same biological family (Vespertilionidae):

Animals that reach the same age as Keen’s myotis

With an average age of 18.5 years, Keen’s myotis are in good companionship of the following animals:

Weighting as much as Keen’s myotis

A fully grown Keen’s myotis reaches around 6 grams (0.01 lbs). So do these animals: