Ambiguous marks were typically single, short scars usually located on

only 1 body region and could not be reliably attributed to lions. Because 9.5% (n = 67) of individuals were not photographed on both sides, we applied a correction factor to take into account the probability that some individuals may have predation marks on the unphotographed side of the body. The location of each mark on the body was recorded, including body side and region (Fig. 3). To supplement predation-mark data, we examined the season and age of death of 52 giraffe carcasses presumed killed by lions between 1966 and 2011. The data are from a continuous long-term study of lions in the central woodlands and south-eastern plains of Serengeti. Means are reported as ±sd and significance was GSK-3 inhibition α = 0.05. Results presented here focus on marks convincingly attributable buy Ridaforolimus to lions. An estimated 10.6% of giraffes (13.1% of giraffes >1

year old) show evidence of surviving at least 1 lion attack. The estimated prevalence of claw marks was significantly higher among adults (17.6%) than subadults (3.7%) [χ2 = 21.34, degrees of freedom (d.f.) = 1, P < 0.0001]. Of the 7 subadults observed with claw marks, 1 was a yearling, 1 was a 2-year-old and 5 were estimated to be between ages 3 and 5 years at first sighting. No claw marks were observed on calves. We found a highly significant relationship between sex and claw-mark prevalence, with estimated prevalence higher among females (14.1%, n = 379) than males (6.5%, n = 323) (χ2 = 10.69, d.f. = 1, P = 0.001). This result is caused by sex differences among adults [adult females (22.0%) vs. adult males (12.0%), χ2 = 5.83, d.f. = 1, P = 0.016; subadult females (5.4%) vs. subadult males (2.1%), P = 0.27, 2-sided Fisher's exact test]. Predation-mark prevalence for each study area is presented in Table 1. Across age–sex classes, claw-mark prevalence was found to be lower in Kirawira than in Seronera, the 2 well-sampled areas. For giraffes of both sexes >1 year old, estimated claw-mark prevalence was 1.3% for

Kirawira (n = 177) compared with 18.3% for Seronera (n = 311) Amylase (χ2 = 29.14, d.f. = 1, P < 0.0001). This result is attributable to the difference in claw-mark prevalence among adults. Figure 4 summarizes age–sex trends in claw-mark prevalence for Kirawira and Seronera. We observed fresh claw marks, evidenced by dried blood, on 1 subadult female. All other claw marks appeared healed or were too superficial to cause bleeding (Fig. 2). No injuries appeared severe, but subcutaneous damage could not be assessed. Giraffes with hind leg marks did not have any visible reduction in leg motion. We observed no instances of hamstringing. Claw marks were most frequently detected on the rump, followed by the hind leg and flank (Fig. 3). Hind leg marks occurred both above and below the hock. We observed partially amputated tails on 6.8% (n = 5) of individuals with claw marks (n = 74) (Fig. 2d).