Tsavo Man-Eaters

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The Tsavo Man-Eaters on display in the Field Museum of Natural History in Chicago, Illinois, the United States of America

The Tsavo Man-Eaters were a pair of man-eating lions in the Tsavo region, which were responsible for the deaths of a number of construction workers on the Kenya-Uganda Railway between March and December 1898. The significance of this lion pair was their unusual behavior of killing men and the manner of their attacks.


The first lion killed by Patterson, now known as FMNH 23970
The second lion, FMNH 23969

As part of the construction of a railway linking Uganda with the Indian Ocean at Kilindini Harbour, in March 1898 the British started building a railway bridge over the Tsavo River in Kenya. The project was led by Lieutenant-Colonel John Henry Patterson. During the next nine months of construction, two maneless male Tsavo lions stalked the campsite, dragging Indian workers from their tents at night and devouring them. Crews tried to scare off the lions and built campfires and bomas, or thorn fences made of whistling thorn trees around their camp for protection to keep the man-eaters out, all to no avail; the lions leaped over or crawled through the thorn fences. After repeated attacks, hundreds of workers fled from Tsavo, halting construction on the bridge. Patterson set traps and tried several times to ambush the lions at night from a tree. After repeated unsuccessful attempts, he shot the first lion on 9 December 1898. Twenty days later, the second lion was found and killed. The first lion killed measured 9 ft 8 in (2.95 m) from nose to tip of tail. It took eight men to carry the carcass back to camp.

Patterson wrote in his account that he wounded the first lion with one bullet from a high-calibre rifle. This shot struck the lion in its back leg, but it escaped. Later, it returned at night and began stalking Patterson as he tried to hunt it. He shot it through the shoulder, penetrating its heart with a more powerful rifle and found it lying dead the next morning not far from his platform.

The second lion was shot up to nine times, five with the same rifle, three with a second, and once with a third rifle.[1] The first shot was fired from atop a scaffolding that Patterson had built near a goat killed by the lion. Two shots from a second rifle hit the lion 11 days later as it was stalking Patterson and trying to flee. When they found the lion the next day, Patterson shot it three more times with the same rifle, severely crippling it, and he shot it three times with a third rifle, twice in the chest, and once in the head, which killed it. He claimed it died gnawing on a fallen tree branch, still trying to reach him.[1]

The construction crew returned and finished the bridge in February 1899. The exact number of people killed by the lions is unclear. Patterson gave several figures, overall claiming that there were 135 victims.[2][3]

After 25 years as Patterson's floor rugs, the lions' skins were sold to the Chicago Field Museum in 1924 for a sum of $5,000. The skins arrived at the museum in very poor condition. The lions were reconstructed and are now on permanent display along with their skulls.

Modern research[edit]

The skulls of the Tsavo Man-Eaters, located in the diorama

In 2001, a review about causes for man-eating behaviour among lions revealed that the proposed human toll of 100 or more was most likely an exaggeration and that the more likely total was 28–31 victims. This reduced total was based on their review of Colonel Patterson's original journal, courtesy of Alan Patterson.[4][5]

The two lion specimens in Chicago's Field Museum are known as FMNH 23970, the 'crouching' mount, killed on 9 December 1898, and FMNH 23969, the 'standing' mount, killed on 29 December 1898. Recent studies on the isotopic signature analysis of Δ13C and Nitrogen-15 in their bone collagen and hair keratin were published in 2009. Using realistic assumptions on the consumable tissue per victim, lion energetic needs, and their assimilation efficiencies, researchers compared the man-eaters' Δ13C signatures to various reference standards: Tsavo lions with normal (wildlife) diets, grazers and browsers from Tsavo East and Tsavo West, and the skeletal remains of Taita people from the early 20th century. Interpolation of their estimates across the 9 months of recorded man-eating behavior suggested that FMNH 23969 ate the equivalent of 10.5 humans and that FMNH 23970 ate 24.2 humans.[6]

The scientific analysis does not differentiate between entire human corpses consumed, compared to parts of individual prey, since the attacks often raised alarm forcing the lions to slink back into the surrounding area. Many workers over the long construction period went missing, died in accidents, or simply left out of fear; so it is likely almost all of the builders, who stayed on, knew someone missing or supposedly eaten. It appears that Colonel Patterson may have exaggerated his claims as have subsequent investigators (e.g. "135 armed men", Neiburger and Patterson, 2000) though none of these modern studies have taken into account the people who were killed but not eaten by the animals.[7] The diet of the victims would also affect their isotopic signature. A low meat diet would produce a signature more typical of herbivores in the victims, affecting the outcome of the test.[8] That fact is important to note since many of the workers at Tsavo were Hindus and may have had a vegetarian diet. This research also excludes, but does not disprove, the claims that the lions were not eating the victims they killed but merely killing just to kill. Similar claims have been made of other wildlife predators.[citation needed]

Possible causes of "man-eating" behaviour[edit]

Theories for the man-eating behaviour of lions have been reviewed by Peterhans and Gnoske, as well as Bruce D. Patterson (2004). Their discussions include the following:

  • An outbreak of rinderpest (cattle plague) in 1898 devastated the lions' usual prey, forcing them to find alternative food sources.
  • The Tsavo lions may have been accustomed to finding dead humans at the Tsavo River crossing. Slave caravans to the center of the Arab slave trade, Zanzibar, routinely crossed the river there.
  • "Ritual invitation", or abbreviated cremation of Hindu railroad workers, invited scavenging by the lions.

An alternative argument indicates that the first lion had a severely damaged tooth that would have compromised its ability to kill natural prey.[9] This theory has been generally disregarded by the general public and Colonel Patterson, who killed the lions, personally disclaimed it, saying that he damaged that tooth with his rifle while the lion charged him one night, prompting it to flee.[10]

Studies indicate the lions ate humans as a supplement to other food, not as a last resort. Eating humans was probably an alternative to hunting or scavenging caused by dental disease and/or a limited number of prey.[11][12]

In a 2017 study carried out by the team of Dr. Bruce Patterson it has been found that one of the lions had an infection at the root of his canine tooth, which made it hard for the lion to hunt. Lions normally use their jaws to grab prey like zebras and wildebeests and suffocate them.[13]

Popular culture[edit]

In film[edit]

Patterson's book was the basis for several movies:

In games[edit]

  • The lions appear as a difficulty to be overcome in the "Cape to Cairo" scenario of the video game Railroad Tycoon II.
  • Tsavo'ka (translation: Ghost in the Darkness) is a rare tiger that can be found on the Timeless Isle in World of Warcraft.
  • In Cabela's Dangerous Hunts 2011 the lions were mentioned by the character Mbeki to the main character Cole as he was telling him about mysterious animals that have been terrorizing local villages.

In print[edit]

  • Ghosts of Tsavo: Stalking the Mystery Lions of East Africa (2002) by Philip Caputo[14]
  • The Lions of Tsavo: Exploring the Legacy of Africa's Notorious Man-Eaters (2004)[15] by Field Museum of Natural History scientist Bruce D. Patterson[16]
  • The plot of the Willard Price book Lion Adventure (1967) was inspired by the man-eaters of Tsavo, wherein Hal and Roger Hunt are hired to deal with a man-eating lion that is preying on railroad workers. At one point in the book, Hal recounts Colonel Patterson's original tale.
  • The story of Patterson and the man-eating lions was also an inspiration for the book Three Weeks in December (2012) by Audrey Schulman.[17]

See also[edit]


  1. ^ a b chapter IX The Death of the Second Man-Eater, The Man-Eaters of Tsavo and other East African Adventures by Lieut.-Col. J. H. Patterson, DSO publication date unknown as recorded on Amazon Kindle[page needed]
  2. ^ Patterson, Bruce D. (2004). The Lions of Tsavo: Exploring the Legacy of Africa's Notorious Man-Eaters. McGraw-Hill. ISBN 0-07-136333-5.[page needed]
  3. ^ "Field Museum uncovers evidence behind man-eating; revises legend of its infamous man-eating lions" (Press release). The FIeld Museum. 2003.
  4. ^ Kerbis Peterhans, J. C. & Gnoske, T. P. (2001). "The science of 'man-eating' among lions Panthera leo with a reconstruction of the natural history of the 'man-eaters of Tsavo'". Journal of East African Natural History. 90 (1): 1–40.
  5. ^ Caputo, P. Ghosts of Tsavo. p. 274. ISBN 0-7922-6362-6.
  6. ^ Yeakel, J. D.; Patterson, B. D.; Fox-Dobbs, K.; Okumura, M. M.; Cerling, T. E.; Moore, J. W.; Koch, P. L.; Dominy, N. J. (2009). "Cooperation and individuality among man-eating lions". Proceedings of the National Academy of Sciences. 106 (45): 19040–3. doi:10.1073/pnas.0905309106. PMC 2776458. PMID 19884504.
  7. ^ Janssen, K. (2009). "Scientists restate Tsavo lions' taste for human flesh". Chicago Tribune.
  8. ^ Krueger, Harold W.; Sullivan, Charles H. (1984). "Models for Carbon Isotope Fractionation Between Diet and Bone". Stable Isotopes in Nutrition. ACS Symposium Series. 258. p. 205. doi:10.1021/bk-1984-0258.ch014. ISBN 0-8412-0855-7.
  9. ^ "Field Museum". Retrieved 2018-07-24.
  10. ^ "The Tsavo Man-Eaters". lionlamb.us.
  11. ^ "Why Man-Eating Lions Prey on People—New Evidence". 2017-04-19. Retrieved 2017-04-19.
  12. ^ DeSantis, Larisa R. G.; Patterson, Bruce D. (2017-04-19). "Dietary behaviour of man-eating lions as revealed by dental microwear textures". Scientific Reports. 7 (1): 904. doi:10.1038/s41598-017-00948-5. ISSN 2045-2322. PMC 5430416. PMID 28424462.
  13. ^ Desantis, Larisa R. G.; Patterson, Bruce D. (2017). "Dietary behaviour of man-eating lions as revealed by dental microwear textures". Scientific Reports. 7 (1): 904. doi:10.1038/s41598-017-00948-5. PMC 5430416. PMID 28424462.
  14. ^ Philip Caputo (June 1, 2003). Ghosts of Tsavo: Stalking the Mystery Lions of East Africa (First ed.). National Geographic. ISBN 0792241002.
  15. ^ Bruce Patterson (January 22, 2004). The Lions of Tsavo: Exploring the Legacy of Africa's Notorious Man-Eaters (1 ed.). McGraw-Hill. ISBN 0071363335.
  16. ^ "Field Museum Scientist Bruce Patterson's Tsavo Lions Research Highlighted in Emirates Airline's 'Open Skies'". Field Museum website's About Us page. Archived from the original on 2013-11-10.
  17. ^ Schulman, Audrey (2012). Three Weeks in December. New York: Europa Editions. p. 352. ISBN 978-1-60945-064-9.


  • "Field Museum uncovers evidence behind man-eating; revises legend of its infamous man-eating lions" (Press release). The FIeld Museum. January 14, 2003.*Neiburger, E.J.; Patterson, B.D. (2000). "Man eating lions…a dental link". Journal of the American Association of Forensic Dentists. 24 (7–9): 1–3.
  • Neiburger, EJ; Patterson, BD (2000). "The man-eaters with bad teeth". The New York state dental journal. 66 (10): 26–9. PMID 11199522.
  • Kerbis Peterhans, J.C.; Gnoske, T.P. (2001). "The science of 'Man-eating' among lions (Panthera leo) with a reconstruction of the natural history of the "Man-eaters of Tsavo". Journal of East African Natural History. 90: 1–40. doi:10.2982/0012-8317(2001)90[1:tsomal]2.0.co;2.
  • Patterson, Bruce D.; Neiburger, Ellis J.; Kasiki, Samuel M. (2003). "Tooth Breakage and Dental Disease As Causes of Carnivore–Human Conflicts". Journal of Mammalogy. 84: 190–6. doi:10.1644/1545-1542(2003)084<0190:TBADDA>2.0.CO;2.
  • Patterson, B.D. 2004. The lions of Tsavo: exploring the legacy of Africa’s notorious man-eaters. McGraw-Hill, New York, 231 pp.
  • Patterson, B.D.; Kasiki, S.M.; Selempo, E.; Kays, R.W. (2004). "Livestock predation by lions (Panthera leo) and other carnivores on ranches neighbouring Tsavo National Parks, Kenya". Biological Conservation. 119 (4): 507–516. doi:10.1016/j.biocon.2004.01.013.
  • Patterson, B.D. (2005). "Living with lions in Tsavo, or notes on managing man-eaters". Travel News & Lifestyle (East Africa). 129: 28–31.
  • Dubach, Jean; Patterson, B. D.; Briggs, M. B.; Venzke, K.; Flamand, J.; Stander, P.; Scheepers, L.; Kays, R. W. (2005). "Molecular genetic variation across the southern and eastern geographic ranges of the African lion, Panthera leo". Conservation Genetics. 6: 15–24. doi:10.1007/s10592-004-7729-6.
  • Patterson, B. D.; Kays, R. W.; Kasiki, S. M.; Sebestyen, V. M. (2006). "Developmental Effects of Climate on the Lion's Mane (Panthera Leo)". Journal of Mammalogy. 87 (2): 193–200. doi:10.1644/05-MAMM-A-226R2.1.
  • Gnoske, T. P.; Celesia, G. G.; Kerbis Peterhans, J. C. (2006). "Dissociation between mane development and sexual maturity in lions (Panthera leo): Solution to the Tsavo riddle?". Journal of Zoology. 270 (4): 551–60. doi:10.1111/j.1469-7998.2006.00200.x.
  • Peterhans, Julian C. Kerbis; Kusimba, Chapurukha M.; Gnoske, Thomas P.; Andanje, Samuel; Patterson, Bruce D. (1998). "Man-Eaters of Tsavo: Scientific detectives take up the search for an infamous 'lions' den,' lost for one hundred years". Natural History. 107 (9): 12–4.
  • Patterson, B.D. 2004. The lions of Tsavo: exploring the legacy of Africa’s notorious man-eaters. McGraw-Hill, New York, 231 pp.


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