Bats: Megachiroptera

Summary: Join Kiersten as she talk about the largest bats in the world, the Megachiroptera. Don’t worry it’s not scary at all!

 

For my hearing impaired listeners, a complete transcript of this podcast follows the show notes on Podbean

 

Show Notes:

https://www.ecologyasia.com

https://batcon.org

“Bats in Question: A Smithsonian Answer Book,” by Don E. Wilson

Music written and performed by Katherine Camp

 

Transcript

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Kiersten - This is Ten Things I Like About…a ten minute, ten episode podcast about unknown or misunderstood wildlife.

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Kiersten - Welcome to Ten Things I Like About… This is a podcast about misunderstood or unknown creatures in nature. Some we’ll find right out side our doors and some are continents away but all are fascinating. 

This podcast will focus ten, ten minute episodes on different animals and their amazing characteristics. Please join me on this extraordinary journey, you won’t regret it.

The second thing I like about bats is Megachiroptera. If you remember from the last episode, which I’m sure you do, Megachiroptera refers to the Old World bats found in Asia, Africa, Australia, and some Pacific Islands. These are the larger bat species and in this episode we’re going to take a closer look at them.

You may know Megachiroptera by their more commonly used name, Flying Foxes. They get the name from the fact that their faces look a lot like foxes. You may also hear these bats referred to as the Old World Fruit bats or megabats, There is only one Family under Suborder Megachiroptera and that is Family Pteropodidae. There are approximately 170 species of megabats but keep in mind we are always discovering new species of animals and scientists are always rearranging classifications based on new information. 

Where are Megachiroptera found? They can be found in Asia, Africa, Australia, and on a few islands in the Pacific Ocean. It is often said that they are Old World species only. That refers to the fact that they are not found in the Americas. No Megachiroptera are found in North, Central, or South America. Since I live in North America that make me a little sad because megabats are freaking awesome!

What kinds of habitats are these bats found in? That is often dictated by what they eat and most Megachiroptera are frugivores. So, they will be found where fruits are very plentiful. This places the bats in forested habitats that have large fruit bearing trees for our bigger species and medium size fruits for our smaller species. Forests seems to be the typical choice of most Megachiroptera because it offers the most variable fruit.

So what do they eat? We just answered this question. Most Megachiroptera eat fruit. Fruit makes up the majority of their diet, but an occasional flower or leaf might get thrown in the mix. It’s very interesting to watch fruit bats eat because they don’t actually eat the pulp of the fruit. They bite into the fruit and chew it into a pulpy mess letting the juices of the fruit flow down their throat as the more fibrous portions of the fruit fall out the sides of their mouth.

I did a two-week internship at the Lubee Foundation in Gainesville, FL some time ago and got to see this up close and personal. I was all prepared to watch these bats tear into the pieces of fruit and leave nothing behind, but that is not what happened. We were cleaning chewed up fruits off the floor by the shovelful. It was kinda gross, but it did not take away from the majesty of these animals.

What kind of fruits are we talking about? A lot of the same things that we eat. In the wild they will eat bananas, mango, papaya, figs, various berries, and citrus fruits. In captivity they get a lot of the same fruits with some different kinds of melons thrown in, as well. The fact that these bats eat the same kinds of fruits that we like is what gets them into trouble with fruit growers, but these bats are looking for the overripe fruit and tend to leave the ripe fruit or slightly underripe fruit that growers pick to sell alone. These bats actually do the fruit growers a favor by getting rid of the overripe fruit that attracts destructive insects and the bats help spread seeds to propagate more fruit plants.

Are fruit bats and flying foxes the same kind of bat? Yes and no. The term Flying Foxes typically refers to the Pteropus genus. These bats are the ones that have the long muzzle, the tiny little ears, the round heads, large teeth, and look a lot like foxes. These bats are fruit bats, but there are other species of bats that are also fruit bats but are not Pteropus bats. 

One of the questions people ask about Flying Foxes in particular, is why they have such large, scary teeth? They use those large, scary teeth to rip into the tough skin of the fruit they eat. Hav you ever tried to bite into a mango, or papaya or banana with just your teeth? It’s tough. Since they don’t have opposable thumbs, they use their teeth.

Megachiroptera tend to hang out in large groups and roosts during the day in trees. They will hang from their short back legs using the large curved claws that are used only for roosting. You can see them hanging in the tallest trees like Christmas ornaments. Like their smaller cousins, they do tend to be more active at night, but you can see them flying at dawn and dusk. This makes them a bit more crepuscular than nocturnal, but they can still be moving around at night. 

Unlike their smaller cousins, they don’t seem to use echolocation much, if at all. It does make sense that they might not use this because their prey items are fruit. The fruit typically doesn’t fly around at night trying to avoid being eaten by a bat. Scientists are still trying to determine if some species of Megachiroptera use echolocation, possibly in a different way than insect eating Microchiroptera.

Fruit bats do have better vision than their smaller, insect eating cousins because they rely on that to find their food. Most flying foxes actually have color-vision to help them find their fruit and determine whether it is ripe enough for them to eat. When they get close enough to the chosen item, they will also use their sense of smell to make sure this is just what they want. 

Now both Mega and Micro bats have essentially the same anatomy, with one striking difference. Megachiroptera have a large hook that protrudes from the top of the wing that looks an awful lot like a thumb with a claw at the end. They use this to help grasp fruit and use as a way to grasp onto branches when they need to hold on with their wings for various reasons. 

The largest species of Megachirotera comes from southeastern Asia. It is found only on the islands of the Philippines. The Golden-crowned Flying Fox has a wingspan over five feet long and is the heaviest bat weighing in at 3 pounds. It gets it’s name from the yellow colored fur that adorns it head and is also known as the Golden-capped Fruit Bat. 

The smallest species of megabat is the Spotted-winged Fruit Bat that is found in southern Thailand through Peninsular Malaysia to the Riau Archipelago and parts of Borneo. They weigh in at 15 grams and are only 5-6cm from head to toe. They get their name from the pale spots on the wings, fingers joints, face, and base of the ear. They are fruit eaters and are most often found in lowland primary rainforest or tall secondary forests. As you can see there is quite a wide range of species in the Megachiroptera.

Now I could go on, but I have used up my time. Thanks for joining me for my second favorite thing about bats, the Megachiroptera.  

 

 

 

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Join me next week for another exciting episode about bats.  

    

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This has been an episode of Ten Things I like About with Kiersten and Company. Original music written and performed by Katherine Camp, piano extraordinaire.