- Terrestrial Biomes
Lasiurus borealis, which is slightly larger. Most cranial measurements of are significantly larger than other species, and it also lacks the frosted appearance that L. borealis exhibits. Lasiurus blossevilli has a short rostrum and ears that are short and rounded, with a prominent tragus. Its interfemoral membrane is covered in fur, with the exception of the last posterior third of the membrane, which is only sparsely haired. Their tails extend to the edge of the uropatagium. Western red bats have a total length of 103 mm. Length from notch to ear averages 13 mm, and forearm length is 35 to 45 mm. Average length of tail is 49 mm, with a foot length of 10 mm. (Lesson and Garnot, 1997; Pierson and Rainey, 1998; Texas Parks and Wildlife Department, 2013)is a medium sized bat with red-colored pelage, varying from rusty red to brownish red. This red fur distinguishes from all other western bats with the exception of the Eastern Red Bat,
- Average length
- 103 mm
- 4.06 in
- Range wingspan
- 35 to 45 mm
- 1.38 to 1.77 in
Vespertilionids have been known to exhibit diverse mating systems. Though there is not much information on (McCracken and Wilkinson, 2000), in its family there are systems such as monogamy, polyandry, seasonal multi male/multi female groups, year-round harems with less stable female composition, and seasonal single male/multi female groups. Some vespertilionids have also exhibited promiscuous mating systems and resource defense polygyny.
Red bats can have up to five pups in a litter, unlike most in the vespertillionidae family which tend to have a single offspring each year. Some vespertillionids have the ability to delay certain aspects of reproduction as an adaptation for their winter hibernation, such as storing sperm until spring. Because the insects that the bats eat are most abundant during the early summer, red bats mate in late summer to early fall and store the sperm in the vagina or uterus until after hibernation. Once the female has aroused from hibernation, ovulation occurs and the sperm is motile. This allows the babies to be born during the ideal time for their feeding habits. Once the pups are born, they can fly at 3 to 6 weeks of age. (Texas Parks and Wildlife Department, 2013)
- Key Reproductive Features
- seasonal breeding
- gonochoric/gonochoristic/dioecious (sexes separate)
- delayed fertilization
- Breeding season
- breed during late summer to early fall.
- Range number of offspring
- 1 to 5
- Average number of offspring
- Range gestation period
- 80 to 90 days
Though there is not much data on the parental investment that Lasiurus borealis that may have similar parental care. During the day, a L. borealis mother allows her young to cling to her with their wings while she hangs. The babies hang from a twig or leaf as they clasp their mother so that she is not burdened by the full weight of of her pups. During any hour of the day, young can be found exercising, stretching, cleaning themselves, and interacting with their mother. The mother will leave the young in the evening to search for food. Vespertillionid mothers will provide milk for their pups while they grow until they have reached at least 90% of their adult wing dimensions. This is a unique investment into the young that is advantageous because the pups are unable to maintain flight and forage for a long period of time until they have reached those wing dimensions. (Barbour and Davis, 1969; Racey and Swift, 1995)displays, there have been many observations of the closely related
The lifespan ofis unknown.
There is not any evidence at this time to indicate that Western Red Bats undergo mass migration, but some evidence is available for the eastern form and other Lasiurus species. Most Lasiurus species migrate seasonally, traveling to more temperate climates for the winter, but some red bats have been discovered to hibernate in leaf litter throughout the winter instead of migrating. It is unknown whether this is the case for or not. It is difficult to determine if western red bats migrate during cold winters considering that most western red bats have been recorded in California during the winter, where they would not experience extreme winter climates. tends to roost alone in the foliage of trees such as willows, cottonwoods, and sycamores. These roost sites are used during the day as the bat sleeps, and are left roughly two hours after sunset to forage for insects. (Pierson and Rainey, 2004; Texas Parks and Wildlife Department, 2013)
Communication and Perception
Vespertilionids possess a specialized larynx that allows them to produce ultrasonic sounds which are then emitted through their nose or mouth. This form of communication is called echolocation. The ultrasonic sound refracts off of objects and returns to their highly modified ears. The bat's brain can then use the information gathered from the echoes to produce a picture of its surroundings. Because (Woodward, 2004)is active at dusk and during the night, it uses echolocation to avoid running into objects while flying and also uses it to locate food as it is foraging without the aid of light.
Red bats have a diet of insects, with about 26% of that diet consisting of moths. They forage from tree canopy height to just above ground. They typically begin one to two hours after sunset, with the majority of their foraging corresponding with the activity of the nocturnal insects that they are hunting, sometimes foraging throughout the night to catch the insects that are active in the early hours before sunrise. (Pierson and Rainey, 1998; Texas Parks and Wildlife Department, 2013)has been observed feeding in urban areas around street lights and flood lights, but seem to prefer towns and rural areas to the more highly human populated urban areas. The winter feeding habits of are not well understood, but recent documentations indicate that they occasionally arouse from their hibernation during warm days to forage briefly, then return to their hibernation when temperatures drop again.
- Animal Foods
- Foraging Behavior
- stores or caches food
While many other bat species are well protected from predators due to dwelling in caves and crevices during the day, Virginia opossums, and have been attacked and killed by birds on numerous occasions, with jays being the most common attackers. Other birds that prey upon these bats include falcons, owls, raptors in the genus Accipiter, and even roadrunners. Domestic cats have also been known to prey upon these bats. (Pierson and Rainey, 1998; Texas Parks and Wildlife Department, 2013)is more open to predation because of its foliage dwelling habits. Western red bats have been recorded being preyed upon by
Economic Importance for Humans: Positive
- Positive Impacts
- controls pest population
Economic Importance for Humans: Negative
A potential detriment to human populations that these bats present is disease transmission. Two diseases that bats can transfer to humans are rabies and histoplasmosis. A significantly low percentage of these bats contract rabies, so they do not pose a larger threat to humans that dogs or cats. In the instance that a bat has rabies, it will rarely show signs of aggression and will die shortly after. Humans can be exposed to histoplasmosis when contaminated dust particles in the air are inhaled. (Woodward, 2004)
is categorized as a species of "least concern" by the IUCN.
Jenifer Lavender (author), Georgia Southern University, Michelle Cawthorn (editor), Georgia Southern University, Angela Miner (editor), Animal Diversity Web Staff.
living in the Nearctic biogeographic province, the northern part of the New World. This includes Greenland, the Canadian Arctic islands, and all of the North American as far south as the highlands of central Mexico.
living in the southern part of the New World. In other words, Central and South America.
uses sound to communicate
living in landscapes dominated by human agriculture.
young are born in a relatively underdeveloped state; they are unable to feed or care for themselves or locomote independently for a period of time after birth/hatching. In birds, naked and helpless after hatching.
- bilateral symmetry
having body symmetry such that the animal can be divided in one plane into two mirror-image halves. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria.
an animal that mainly eats meat
- causes disease in humans
an animal which directly causes disease in humans. For example, diseases caused by infection of filarial nematodes (elephantiasis and river blindness).
- causes or carries domestic animal disease
either directly causes, or indirectly transmits, a disease to a domestic animal
uses smells or other chemicals to communicate
active at dawn and dusk
- delayed fertilization
a substantial delay (longer than the minimum time required for sperm to travel to the egg) takes place between copulation and fertilization, used to describe female sperm storage.
The process by which an animal locates itself with respect to other animals and objects by emitting sound waves and sensing the pattern of the reflected sound waves.
animals that use metabolically generated heat to regulate body temperature independently of ambient temperature. Endothermy is a synapomorphy of the Mammalia, although it may have arisen in a (now extinct) synapsid ancestor; the fossil record does not distinguish these possibilities. Convergent in birds.
- female parental care
parental care is carried out by females
forest biomes are dominated by trees, otherwise forest biomes can vary widely in amount of precipitation and seasonality.
An animal that eats mainly insects or spiders.
offspring are produced in more than one group (litters, clutches, etc.) and across multiple seasons (or other periods hospitable to reproduction). Iteroparous animals must, by definition, survive over multiple seasons (or periodic condition changes).
having the capacity to move from one place to another.
- native range
the area in which the animal is naturally found, the region in which it is endemic.
active during the night
Referring to something living or located adjacent to a waterbody (usually, but not always, a river or stream).
- seasonal breeding
breeding is confined to a particular season
reproduction that includes combining the genetic contribution of two individuals, a male and a female
mature spermatozoa are stored by females following copulation. Male sperm storage also occurs, as sperm are retained in the male epididymes (in mammals) for a period that can, in some cases, extend over several weeks or more, but here we use the term to refer only to sperm storage by females.
- stores or caches food
places a food item in a special place to be eaten later. Also called "hoarding"
living in residential areas on the outskirts of large cities or towns.
uses touch to communicate
that region of the Earth between 23.5 degrees North and 60 degrees North (between the Tropic of Cancer and the Arctic Circle) and between 23.5 degrees South and 60 degrees South (between the Tropic of Capricorn and the Antarctic Circle).
Living on the ground.
uses sound above the range of human hearing for either navigation or communication or both
uses sight to communicate
reproduction in which fertilization and development take place within the female body and the developing embryo derives nourishment from the female.
Barbour, R., W. Davis. 1969. Bats of America. Lexington, Kentucky: The University of Kentucky Press.
Bucknell Univesity, 2008. "http://www.bucknell.edu/msw3/browse.asp?id=13801890." (On-line). Wilson & Reeder’s Mammal Species of the World, Third Edition. Accessed April 22, 2013 at
Lesson and Garnot, 1997. "Western Red Bat, http://www.nsrl.ttu.edu/tmot1/lasiblos.htm." (On-line). Accessed April 22, 2013 at
McCracken, G., G. Wilkinson. 2000. Bat Mating Systems. Reproductive Biology of Bats, 12: 3-5. Accessed April 22, 2013 at http://www.life.umd.edu/faculty/wilkinson/batchapter.pdf.
Pierson, E., W. Rainey. 2004. "Distribution and Status of Western Red Bats (http://mlpa.dfg.ca.gov/wildlife/nongame/publications/bm_research/docs/2006_04.pdf.) in California" (On-line). State of California Resources Agency, Department of Fish and Game habitat Conservation Planning Branch.. Accessed April 22, 2013 at
Pierson, E., W. Rainey. 1998. "Terrestrial Mammal Species of Special Concern in California" (On-line). California Department of Fish and Game. Accessed April 22, 2013 at http://www.dfg.ca.gov/wildlife/nongame/ssc/docs/mammal/species/11.pdf.
Racey, P., S. Swift. 1995. Ecology, Evolution and Behavior of Bats. Oxford: Clarendon Press.
Texas Parks and Wildlife Department, 2013. "Western Red Bat (http://www.tpwd.state.tx.us/huntwild/wild/species/westred/.)" (On-line). Texas Parks & Wildlife. Accessed April 22, 2013 at
Woodward, N. 2004. "Lasiurus borealis, Red Bat" (On-line). Accessed April 22, 2013 at http://www4.uwsp.edu/biology/facilities/vertebrates/Mammals%20of%20Wisconsin/Lasiurus%20borealis/Lasiurus%20borealis%20page.htm.