Table 4.
Number of species indicating the origin (captive, wild, or/and unknown) from which demographic measures or rates were estimated for all tetrapods
| Demographic measure | Origin/no. of species | ||
| Fertility | Wild | Captive | Unknown |
| Age at first reproduction | 1,222 | 43 | 4,114 |
| Interlitter/interbirth interval | 402 | 10 | 1,256 |
| Litter/clutch size | 2,413 | 31 | 13,735 |
| Proportion of reproductive females | 44 | 0 | 0 |
| Recruitment | 22 | 0 | 0 |
| Age- or stage-specific fertility rates | 416 | 14 | 22 |
| Survival | |||
| Maximum recorded life span | 1,483 | 2,358 | 5,128 |
| Mean age of (adult) population | 0 | 0 | 114 |
| Crude mortality | 1,055 | 13 | 229 |
| Age- or stage-specific death rate | 580 | 48 | 26 |
A single species may have data from different origins.