| perinatal mortality and season of birth in captive wild ungulates. | the magnitude of perinatal mortality in 50 species of captive wild ungulates born at the zoological society of london's collections at regent's park and whipsnade between 1975 and 1985 is reviewed. thirty-five per cent of 2471 ungulates born during this 11 year period died before six months old and most deaths occurred in the first week after birth. similar findings have been reported at other zoos and in the wild. the seasonal distribution of births is described in 43 species. significantly hig ... | 1987 | 3590601 |