Table 4. DLC Animal List variable descriptions.

count	Animal List variable name	Animal List Variable Definition
1	Taxon	Taxonomic code: In most cases, comprised of the first letter of the genus and the first three letters of the species; if taxonomic designation is a subspecies, comprised of the first letter of genus, species, and subspecies, and hybrids are indicated by the first three letters of the genus. See Table 1 for details.
2	DLC_ID	Specimen ID: Unique identification number assigned by the DLC at accession of animal.
3	Hybrid	Hybrid status: N=not a hybrid. S=species hybrid. B=subspecies hybrid. If sire is one of multiple possible and animal could be a hybrid, it is designated a hybrid.
4	Sex	Sex: M=male. F=Female. ND=Not determined
5	Name	House name: Animal name assigned at DLC
6	Current_Resident	Resident status: Whether or not the animal currently lives in the DLC colony.
7	StudBook	Studbook Number: Regional or global unique ID among captive individuals of that species; assigned by AZA studbook keeper. Not all individuals have studbook numbers in this data record.
8	DOB	Date of Birth: DOB is an exact date unless there is an entry in the ‘Estimated_DOB’ field.
9	Birth_Month	Month of birth: Identified from DOB
10	Estimated_DOB	Date of Birth estimate: Whether or not the date of birth is an estimate. Y=estimated to the nearest year, M to the nearest month, and D to the nearest day. If there is a number after the letter code, that indicates to the Nth value of the code. U=unknown. If there is no entry in this field, DOB is not an estimate.
11	Birth_Type	Type of birth: Whether the animal was captive-born (CB), wild-born (WB) or of unknown birth type (UNK)
12	Birth_Institution	Birth institution: Name or ISIS abbreviation of institution where animal was born. Duke Prim=DLC. For wild caught animals, birth institution=country of origin, if known.
13	Litter_Size	Litter size: Number of infants in the litter the focal animal was born into (including focal animal). Only indicated where verifiable (born at DLC). A missing value indicates that the litter size is unknown.
14	Expected_Gestation_d	Expected gestation length: Values based on DLC observations and reports from the literature, in days
15	Estimated_Concep	Date of estimated conception: Calculated as (DOB-Expected_Gestation)
16	Concep_Month	Month of estimated conception: Identified from Estimated_Concep
17	Dam_ID	Specimen ID of female parent. DLC unique ID preferred if there is one. Local ID of another ISIS-reporting institution if known and no DLC number exists. ‘Wild’ indicates dam of wild-caught individual. ‘Unk’ or no data indicates dam is unknown.
18	Dam_Name	House name of female parent (at DLC)
19	Dam_Taxon	Taxon of female parent: Based on taxonomic code described above
20	Dam_DOB	Date of birth of female parent: If female parent is wild caught or of unknown origin, this date is an estimate.
21	Dam_AgeAtConcep_y	Estimated age of female parent at conception of focal animal: in years ((Estimated_Concep-Dam_DOB)/365)
22	Sire_ID	Specimen ID of male parent: DLC number preferred if there is one. Local ID of another ISIS-reporting institution if known and no DLC number exists. ‘Wild’ indicates sire of wild-caught individual. ‘MULT’ indicates multiple possible sires. A following number indicates number of possibilities (e.g. MULT2). ‘Unk’ or no data indicates unknown sire and may include cases of multiple possible sires.
23	Sire_Name	House name of male parent (at DLC)
24	Sire_Taxon	Taxon of male parent: Based on taxonomic code described above
25	Sire_DOB	Date of birth of male parent: If male parent is wild caught or of unknown origin, this date is an estimate.
26	Sire_AgeAtConcep_y	Estimated age of male parent at conception of focal animal: in years ((Estimated_Concep-Dam_DOB)/365)
27	DOD	Date of death: Verified date an animal died. Missing indicates animal is either alive or status is unknown
28	AgeAtDeath_y	Age at death: Age of animal at verifiable date of death, in years ((DOD-DOD)/365). Missing indicates animal is either alive or status is unknown.
29	AgeOfLiving_y	Age if alive: Verifiable living age of DLC-owned animals and/or current residents at DLC on loan, in years as of the date the datafile was updated ((date of last update-DOB)/365). Missing indicates animal is either dead or status is unknown.
30	AgeLastVerified_y	Last verifiable age: Age of animal at most recent date a non-DLC owned, non-current resident animal was verifiably alive, in years. Dates were obtained from ISIS as entered by other institutions (dates of live weight or animal transfer) or via direct communication from other animal facilities. ((DateLastVerified-DOB)/365). Missing indicates animal is known to be dead or alive.
31	AgeMax_LiveOrDead_y	Maximum age: The animal's age from any of the three age categories (each individual must have a value in one of the three) indicating the maximum age the animal could have achieved as of the date the datafile was updated.
32	N_known_offspring	Number of offspring: Number of offspring the individual is known to have produced. There may be additional offspring for this individual if they were born at another institution or if this individual is a possible, rather than known, parent.