14 



A. Comfort 



• OVISMUSIMON 



o AMMOTRAGUS LERVIA 



— WILD O DALLI CMURIE) 



• MERINO STUD EWESCKELLEY) 



WOLVES 



KY»BIOS- C I U*\6« Ci. OCCIOCNTAUS 



O O o 



WILD GOAT 



49 INUVDUALS 



t — t — ■= — tr-H 



Fig. 3. Survival curves of 

 animals in the London Zoo, 

 sexes combined. Drawn from 

 158 mouflon sheep (Ovis musi- 

 mon), 148 Barbary horned 

 sheep (Ammotragus lervia), 95 

 hybrid wolves (Cams lupus 

 lupus x C. /. occidentalis) and 

 45 wild goats (Capra hircus 

 aegagrus). The curve of sur- 

 vival of wild sheep (O. dalli) 

 and points representing the 

 survival of Merino ewes, are 

 superimposed on the survival 

 curves of zoo sheep. 



