Zoologist, media consultant, and science writer, Dr Karl Shuker is also one of the best known cryptozoologists in the world. He is the author of such seminal works as Mystery Cats of the World (1989), The Lost Ark: New and Rediscovered Animals of the 20th Century (1993; greatly expanded in 2012 as The Encyclopaedia of New and Rediscovered Animals), Dragons: A Natural History (1995), In Search of Prehistoric Survivors (1995), The Unexplained (1996), From Flying Toads To Snakes With Wings (1997), Mysteries of Planet Earth (1999), The Hidden Powers of Animals (2001), The Beasts That Hide From Man (2003), Extraordinary Animals Revisited (2007), Dr Shuker's Casebook (2008), Karl Shuker's Alien Zoo: From the Pages of Fortean Times (2010), Cats of Magic, Mythology, and Mystery (2012), Mirabilis: A Carnival of Cryptozoology and Unnatural History (2013), Dragons in Zoology, Cryptozoology, and Culture (2013), The Menagerie of Marvels (2014), A Manifestation of Monsters (2015), Here's Nessie! (2016), and what is widely considered to be his cryptozoological magnum opus, Still In Search Of Prehistoric Survivors (2016) - plus, very excitingly, his first two long-awaited, much-requested ShukerNature blog books (2019, 2020).

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Sunday 29 July 2018


Photograph of hammer-headed bat currently doing the online rounds on social media (© owner presently unknown to me – reproduced here in a strictly non-commercial Fair Use basis for educational, review purposes only)

During the past couple of days, several internet friends and colleagues have independently brought the above photograph to my attention, asking me whether the creature portrayed in it is real or photoshopped. I can confirm that it is indeed real – it is a specimen of tropical Africa's hammer-headed bat – but due to the optical illusion of forced perspective, i.e. caused by it being positioned much closer to the camera than is the person holding it, this very distinctive-looking bat appears much bigger than it really is.

Nevertheless, seeing this photograph reminds me of what may be some genuinely giant mystery bats, and regarding one of which the hammer-headed bat has indeed been considered as a possible explanation – so here they are.

Taxiderm specimen of a hammer-headed bat (© Dr Karl Shuker)

Native to New Guinea and the Bismark Archipelago, the world's largest known species of modern-day bat is the Bismark fruit bat Pteropus neohibernicus, which sports an extremely impressive wingspan of up to approximately 5.5 ft, and there are several other fruit bat species with sizeable spans too. Moreover, quoting from the third (most recent) edition of the late Gerald L. Wood's still-invaluable source of animal superlatives The Guinness Book of Animal Facts and Feats:

According to Peterson (1964)* a huge example of P. neohibernicus from New Guinea preserved in the American Museum of Natural History, New York, has a head and body length of 455 mm 17.9 in and a span of 1.65 m 5 ft 5 in. He thinks that some unmeasured specimens may reach 183 m 6 ft, but this figure is unconfirmed.

*Peterson (1964) = Russell F. Peterson, Silently, By Night (McGraw-Hill: New York, 1964), an authoritative book on the natural history of bats, a copy of which I own.

However, the cryptozoological chronicles contain details concerning at least two types of giant mystery bats whose wingspan is claimed to be twice as big as the above!

Famous vintage photo of a fruit bat (species unnamed) with a very impressive wingspan (originally © Otto Webb, now public domain? – reproduced here on a strictly non-commercial, Fair Use basis for educational, review purposes only)

The secluded river valleys of western Java in Indonesia are reputedly home to one of these - an enormous but very elusive bat known to the local people as the ahool. It derives its name from the sound of its unmistakeable cry, which it is said to utter three times in succession while on the wing at night.

When questioned by interested Westerners, the locals provide consistent descriptions of the ahool. It has a monkey-like head and flattened humanoid face, a body as big as a one-year-old child's, and a massive 12-ft wingspan. It feeds principally upon large fishes that it snatches from underneath stones on river beds, but is occasionally encountered crouching on the forest floor, whereupon its feet are said to point backward. This last-mentioned feature may initially sound bizarre and implausible, but in reality it actually provides support for believing the remainder of their description, because as bat experts will readily testify, bats' feet do point backwards. Even when hanging upside-down from a branch, a bat wraps its feet around the rear portion of the branch, with its feet curling towards the observer, instead of away from him.

Does a giant bat, or bat-like cryptid, still awaiting scientific discovery explain reports of the ahool? (© Dr Karl Shuker)

One of the most interesting encounters with an ahool comes not from an eyewitness but rather an 'earwitness' (whose testimony was first documented by American cryptozoologist Ivan T. Sanderson in a number of publications). The son of an eminent zoologist, naturalist Dr Ernst Bartels had spent much of his early life in Java, and was well-acquainted with the cries of all of the island's fauna. He was also familiar with the local Sundanese testimony concerning the ahool, but had remained sceptical – until one evening in 1927.

At around 11.30 pm, Dr Bartels had been lying awake in bed inside his thatched house near western Java's Tjidjenkol River, listening to the nocturnal insects' incessant orchestra of noises, when suddenly, from directly overhead, he heard a single loud, clear cry – "A-hool!". A few moments later, he heard it again, but further away now. Immediately, he jumped out of bed, grabbed his torch, and raced outside in the direction of the cry, whereupon he heard it again, for a third and final time, floating back to him from a considerable distance downstream. He stood there, totally transfixed, not because he didn't know what had made this unique triple cry, but rather because he did!

An olitiau encounter (© William M. Rebsamen)

A mystery bat of equally dramatic dimensions has also been encountered in Cameroon, West Africa, and by two very experienced scientific observers. While participating in the famous Percy Sladen Expedition of 1932, the afore-mentioned Ivan T. Sanderson and fellow animal-collector Gerald Russell had been wading down a stream in Cameroon's Assumbo Mountains one evening in search of tortoises to collect when abruptly a jet-black creature with enormous wings and a flattened monkey-like face flew out of the darkness and directly towards Sanderson, its lower jaw hanging down, revealing an abundance of large white teeth.

Sanderson instinctively ducked, then he and Russell fired a number of shots in the direction of this terrifying apparition, but it merely wheeled out of range and vanished back into the darkness, its wings cutting through the still air with a loud hissing sound. The two men agreed that its wingspan was at least 12 ft, and it seemed to have been jet-black in colour. When they told the local hunters back at their camp what had happened, the hunters were all terrified – so much so that after informing the naturalists that their would-be attacker was known as the olitiau, they all fled from the camp!

Exquisite 19th-Century engraving of the hammer-headed bat (public domain)

Sceptics later sought to identify the olitiau as a grotesque species of fruit bat known as the hammer-headed bat Hypsignathus monstrosus. As its name reveals, however, the head and face of this species is extremely long and swollen – wholly dissimilar from the flattened, monkey-like face specifically described by Sanderson and Russell.

A giant bat-like entity has also been reported from Ghana, where it is known as the sasabonsam. In 1939, a report of a dead specimen was published in the West African Review journal, together with a photograph of an alleged carving of one such beast, which depicted it with relatively short wings and a bearded, humanoid face.

Sketch based upon the above-mentioned photograph of an alleged carving of a sasabonsam (© Dr Karl Shuker)

There are two suborders of bats – the mega-bats (constituting the fruit bats), which include most of the largest species; and the micro-bats (constituting all of the other bats), many of which are much smaller. Consequently, we might expect bats with 12-ft wingspans to be more closely allied to the mega-bats than to the micro-bats. In reality, however, the reverse may well be true.

The flattened monkey or humanoid face of the ahool and the olitiau is particularly interesting, because this is very different from the long-muzzled, distinctly fox-like faces of the fruit bats (hence their alternative name of flying fox), but similar to those of many micro-bats. How extraordinary and zoologically iconoclastic it would be if the world's largest bat species ultimately proved not to be mega-bats but micro-bats!

The flap-ornamented but still unequivocally flat face of a micro-bat – namely, the Antillean ghost-faced bat Mormoops blainvillii (public domain)

Finally: several striking photographs of people holding seemingly enormous bats via their outstretched wings can be readily accessed on the internet. However, close examination of these reveals that in each instance the bat – invariably a fruit bat, some species of which are already fairly large – is being held much closer to the camera than the person who is holding it. As with the hammer-headed bat photograph opening this ShukerNature article, these images are merely clever examples of forced perspective.

So, sadly, if we want to discover a bona fide giant bat, we must look for it not online but rather in the riverside jungles of Africa, or listen out for its unique triple cry amid the shadowy forests of Java.

A selection of sourceless online photographs of supposedly giant bats that in reality are nothing more than examples of forced perspective (© owners presently unknown to me – reproduced here on a strictly non-commercial Fair Use basis for educational, review purposes only)

For more information concerning the ahool, olitiau, sasabonsam, and other crypto-bats, be sure to check out my book The Beasts That Hide From Man.


  1. Are there any sources for either of these cryptids that do not derive from Sanderson?

    1. Good comment. Dr Bernard Heuvelmans gives additional reports of African examples in various of his writings, and I've read fairly general accounts of giant Asian bats, but Sanderson was certainly the person responsible for bringing such cryptids to popular attention, so we have to bear in mind therefore that his versions may contain embellishments, something that he was known for adding to his writings, sadly.

  2. Looking at this bat reminded me of sci fi movie called Life Force by Tobe Hooper. The Aliens were giant bats that looked much like the Hammer Head. The twist was that these creatures were the source of the vampires of myth and visited earth at regular periods, hiding in the tail of Halley's Comet. Interesting movie!
    Interesting article too Karl, thanks.

    1. Thanks Martin - I'd never heard of this movie before, I'll have to look out for it, sounds very interesting.

  3. I can't be the only person who instantly thought "this must be the truth behind the myth of the Jersey Devil" when I saw the horse-shoe bat.

    The problem is that its habitat is so far away from North America and that I'm not sure if it ever was kept in captivity anywhere in the Northeastern US...

  4. A number of bat cryptids that are also described as human or monkey-like might be undiscovered relatives of the monkey-faced bats of Melanesia.

  5. there will be cryptids in indonesia that have inspired the wildlife of the skull island in the King Kong movie of the 1930s, since in that film the isla calavera is located in indonesia.

  6. Mmm, very interesting Karl, I had a giant bat encounter when visiting a Brazil and travelling with some friend.

    It was hanging/clinging on the very top of a cliff ‘face’ protrusion (at the very top of a large canyon wall) . . . the really odd thing was there were a few of us there and the atmosphere behaviour of everyone was exceptionally odd/suppressed . . .

    I suspect that because it was in a bats normal sleeping state (i.e. it was sleeping and then if we’d not been in the odd state we’d have got very close to it AND taken photo’s of it too . . . anyway I’ve written about this here: https://www.realitywalker.com/weird-odd-paranormal-parapsychology-experiences/the-giant-bat-encounter-weird-atmosphere-no-one-speaking-day/

    I was wondering Karl, if you have any experience of people being put into a weird 'disengaged' state when encountering weird/not normal 'creatures/phenomenon' because some of few people that left a comment on that page also mentioned 'put off' effects too?