If same individual, first spotted February 2014 in same area of deeply furrowed bark on same Monterey Pine (Pinus radiata). Absent during spring and summer returning prior to October 10, 2014 to same spot!!
More photos available.
I'm not totally familiar with bats. I believe this is the right ID. It was found dead on the sidewalk. I put my foot right next to it for size comparison. I wear a size 10 in men's.
This is a hoary bat call that was detected at the Los Angeles Zoo using a bat echolocation monitoring device. Hoary bats are a migratory bat species that travel from Canada to south America every fall. They only roost in foliage so they are sensitive to urbanization and are great indicators of ecosystem health. The long term monitoring device is in place to collect long term data on Los Angeles bats and to educate zoo visitors and the public about local bats and the important roles they play in ecosystems. The project is a collaboration between the Los Angeles Zoo and the United States Forest Service. All species are identified by using Sonobat bat call analysis software.
Observation and photos courtesy Richard Freiheit.
The hoary bat (Lasiurus cinereus) is a species of bat in the vesper bat family, Vespertilionidae. It occurs throughout most of North America and much of South America, with disjunct populations in the Galápagos Islands. The Hawaiian hoary bat (ssp. semotus), an endangered subspecies, is endemic to Hawaii.