chimps: Gray haired chimpanzees
| chimps | R Documentation |
Gray haired chimpanzees
Description
It is known that humans' hair generally turns gray as they age. Is the same true for chimpanzees? This data set contains demographic information on chimpanzees, together with human ratings of how gray their hair is. The authors' original intent was to determine whether middle-aged chimpanzees got gray with age.
Usage
chimps
Format
A data frame with 165 observations of 159 variables. Some individuals are evaluated twice at different ages.
- individual
Name of the chimpanzee.
- year
Year that photograph was taken.
- sex
Factor with two levels, M and F.
- age
Age in years of chimpanzee at time of photo.
- population
Factor with three levels. NIRC corresponds to New Iberia Research Center, TAI corresponds to Taï National Park, Ivory Coast, and NGOGO corresponds to Ngogo, Kibale National Park, Uganda.
- subspecies
Factor with levels versus and schweinfurthii.
- V1,...,V164
Rankings on scale of 1-6 of how gray the chimpanzees hair is, by human raters.
- grey_score_avg
Mean value of the gray score rankings given by human judges.
Details
From the authors: "The greying of human head hair is arguably the most salient marker of human aging. In wild mammal populations, greying can change with life history or environmental factors (e.g., sexual maturity in silverback gorillas). Yet, whether humans are unique in our pattern of age-related hair depigmentation is unclear."
Source
Tapanes E, Anestis S, Kamilar JM, Bradley BJ (2020) Does facial hair greying in chimpanzees provide a salient progressive cue of aging? PLoS ONE 15(7): e0235610. https://doi.org/10.1371/journal.pone.0235610
https://datadryad.org/stash/dataset/doi:10.5061/dryad.f7m0cfxs7
