hey little bat!

Myzopoda aurita ready to cling! - photo by Daniel Riskin This is the sucker-footed bat , or Myzopoda aurita - myzo meaning "suck," poda meaning "foot." Though contrary to its name and what was previously thought, it does not adhere to surfaces by means of suction but rather by wet adhesion, as research by Daniel Riskin and Paul Racey has discovered. These little guys (and girls) are two inches long and weigh 1/3 of an ounce. They roost head-up, way up in the furled leaves (that open at the top) of the Traveler's tree in Madagascar. Only six species (out of 1,200) of bats are known to roost in an upright position. They do so because it allows for a quick escape from predators. Traveler's tree - photo by Daniel Riskin These Old World bats have flat to slightly convex pads at their wrists and ankles that enable them to cling to the smooth surfaces of the leaves. Or Plexiglas. Myzopoda aurita climbing on Plexiglas - photo by Daniel Riskin foot pad of Myzopoda ...

help...stuck... (Anoura caudifer) - photo by Nathan Muchhala No, this nectar-feeding bat is not really stuck. (Nor what I would call a dainty eater.) Bats are known to push their heads into bat-flowers to lap up the nectar. Anoura caudifer - photo by Nathan Muchhala Anoura fistulata - photo by Nathan Muchhala Indeed. (I love these photos! They're so funny to me!) A bat will insert its head into the flower - even when its tongue is longer than the flower's tube. It extends its tongue as much as it needs to, then retracts it, lapping the nectar much like a dog drinks water. By pushing its head into the flower, the bat collects lots of pollen on its head and chest, inadvertently transferring it to the next flower. Moths are also nectar-feeders; however, when a moth drinks nectar, its tongue acts as a straw. So if a moth evolves a tongue longer than the floral tube, it could potentially partake of the flower's nectar without actually pollinating it. Therefore, the flower is a...

I see you! Geoffroy's tailless bat (Anoura Geoffroyi) - photo by Nathan Muchhala Ever since coming across this word, I can't stop saying it: chiropterophily. Chiropterophily, or pollination of plants by bats, is very common in the tropics. Hundreds of tropical plant species are exclusively or at least partly pollinated by nectar-feeding bats. Many tropical flowers are night-blooming, specializing in attracting bats. Bat-flowers are typically white, cream, or pale green in color, making them easier to see in the dark. They usually have a musky, fermented odor - like that of the bat - or sometimes a fruity odor. They have a large, sturdy, open shape with long, bushy anthers so that the bat's head and chest get coated in pollen when it visits. In return for the bat pollinating the flower, the flower provides the nectar that these high-energy flying mammals need.* Tube-lipped nectar bat (Anoura fistulata) - photo by Nathan Muchhala Nectivorous bats have both good eyesight an...

Inside a tropical rainforest, there's not a lot of wind, apart from high up in the canopy, and plant species tend to be very rare and quite far away from each other. Therefore wind pollination is not an effective means of plant reproduction. The preferred method is animal pollination, and many fascinating processes have evolved both in the pollinizer (the plant) and pollinator (the animal). It's a coevolutionary process - both plants and pollinators become specialized to attract each other. Tropical plants have evolved flowers that entice their preferred pollinator - be it hummingbird, insect, or bat - so that the pollinator will hopefully carry the plant's genes, via the pollen, to another plant of the same species. Sometimes it entices by rewards like nectar - making it a mutualistic relationship - sometimes by trickery,* but it will match its characteristics to the characteristics of a specific pollinator and discourage all other pollinators. At the same time, the poll...

Spix's Disk-Winged Bats ( Thyroptera tricolor ) roost upright in rolled Heliconia and banana leaves. You can see the little suction discs on the thumbs and ankles. These lightweight little insectivores use these to cling to the leaves. The other bat species found at Lapa Rios are the Greater Fishing Bat ( Noctilio leporinus ), Thomas' Fruit Eating Bat ( Artibeus watsoni ), and the Greater White-Lined Bat ( Saccopteryx bilineata ), which is seen but uncommon. These pictures were taken on 6/29/08 along the Osa Trail at Lapa Rios. Link to " Costa Rica: Day 11 - Lapa Rios Osa Trail ." Read about the Sucker-Footed Bat ( Myzopoda aurita) that also roosts head up in "Sucker-Footed Bats Don't Use Suction After All" (Science Daily).

Peters' Epauletted Fruit Bat (Epomophorus crypturus), Kruger National Park - photo by Peet van Schalkwyk Have you ever noticed how under certain lighting conditions some animal's eyes seem to glow? Animals that are nocturnal hunters - and a few of them that are not - have something called eyeshine . Eyeshine is the light that we see reflected back from the animal's tapetum lucidum (a membrane behind the animal's retina). Light enters the eye, passes through the retina, strikes the reflective membrane, and is reflected back through the eye toward the light source. This phenomenon makes the most of what little light there is at night for these nocturnal creatures. a moth with pink eyeshine Humans can display the red-eye effect in flash photography, but we do not have a tapetum lucidum , and thus, do not have eyeshine. Eyeshine is best observed by wearing a head lamp or holding a flashlight at eye level against your temple because the light is reflected right back into ...

The Sucker-Footed Bats, though sometimes referred to as such, are actually Spix's Disk-Winged Bats. Their scientific name is Thyroptera tricolor , Thyroptera meaning "disk" ( thyro ) "wing" ( ptera ). Link to my post on "The Disk-Winged Bats of Lapa Rios."