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In March 1898 the British started building a railway bridge over the Tsavo River in Kenya. The project was led by Lt. Col. 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, around their camp for protection to keep the man-eaters out, to no avail; the lions leaped over or crawled through the thorn fences. After the new 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 endeavours, he shot the first lion on 9 December 1898. Twenty days later, the second lion was found and killed. The first lion killed measured nine feet, eight inches (3 m) from nose to tip of tail. It took eight men to carry the carcass back to camp. The construction crew returned and completed 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.
Patterson writes in his account that he wounded the first lion with one bullet from a Martini-Enfield chambered in .303 calibre. 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 .303 Lee Enfield, and found it lying dead the next morning not far from his platform. The second lion was shot at most nine times, five with a .303 Lee Enfield, three with a Martini-Henry carbine, and once with an unidentified rifle.
The first was fired from atop a scaffolding Patterson had built near goat kills done by the lion. Two, both from the Lee Enfield, were shot into it eleven days later as the lion was stalking Patterson and trying to flee. When they had found the lion the next day thereafter, Patterson shot it three more times with the Lee Enfield, severely crippling it, and shot it three times with the Martini-Henry carbine, 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.
After 25 years as Patterson's floor rugs, the lions' skins were sold to the Chicago Field Museum in 1924 for a sum of US$5,000 (US $66,389.37 in 2012). The lions' skins arrived at the museum in very poor condition. The lions were then reconstructed and are now on permanent display along with the original skulls.
Patterson's accounts were published in his 1907 book The Man-Eaters of Tsavo.
The two lion specimens in Chicago's Field Museum are known as FMNH 23970 (killed 9 December 1898) and FMNH 23969 (killed 29 December 1898). Recent studies have been made upon the isotopic signature analysis of Δ13C and Nitrogen-15 in their bone collagen and hair keratin and published in the Proceedings of the National Academy of Sciences USA. 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. This analysis estimated that FMNH 23969 ate the equivalent of 10.5 humans and that FMNH 23970 ate 24.2 humans.
This leads to the conclusion that the lower number of 35 victims is more likely and confirms the study published 8 years previously by Julian Kerbis Peterhans and Thomas Patrick Gnoske (2001) who estimated 28–31 victims. It appears that Colonel Patterson exaggerated his claims as have subsequent investigators (e.g. ""135 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). 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. 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.
The earlier (2001) study by Tom Patrick Gnoske and Julian Kerbis Peterhans, published in the Journal of the East African Natural History Society, contended 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 (grandson of the Colonel, the Bodleian Library at Oxford University and Colonel Patterson's original publication (1907) This 2001 study systematically reviewed causes of man-eating behavior among lions with particular attention to the Man-Eaters of Tsavo.
Theories for the "man-eating behavior" of lions have been reviewed by Kerbis Peterhans and Gnoske (2001) and Bruce Patterson (2004). Their discussions include the following:
An alternative argument indicates that the first lion had a severely damaged tooth that would have compromised its ability to kill natural prey. Evidence for this is presented in a series of peer-reviewed papers by Neiburger and Patterson (2000, 2001, 2002) and in Bruce Patterson's (2004) book. This theory has been generally disregarded by the general public and Lieutenant-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.
Patterson's book was the basis for several movies:
The incidents were also used in Killers of Kilimanjaro (1959).