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Body length dataset
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File: "data_body_length.txt"

- Photo_date: The date at which the photo was taken
- Scale_length_cm: the length of the reference scale in centimeters
- Scale_length_px: the length of the reference scale in pixels
- Length_px: the length of the seal in pixels
- Length_cm: the length of the seal in centimeters

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Sex ratio dataset
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File: "data_SR_model.txt"

- Name: the seal name
- Id: the seal unique identifier
- N_pups: total number of pups produced by breeding seals 
- Female: number of daughters produced by breeding seals  
- Male: number of sons produced by breeding seals
- Length: relative body length of the seals
- Tenure: number of days a seal spent in the Rivière du Nord 
          breeding site 
- Success: relative reproductive success, i.e., 
	   the number of pups produced by the focal seal 
	   divided by the mean number of pups produced 
	   in the population
- Weights: relative tenure, i.e., the number of days 
           the focal seal spent in the Rivière du Nord breeding site
           divided by the maximum number of days a seal spent 
           in the Rivière du Nord breeding site