1.   After all, animals lived out of doors naturally.

2.   Animals rarely live in completely stable environments.

3.   He presumably spends his winters in a nice clean stable but most animals live in muddy fields.

4.   Smaller animals can therefore live where there is less food, provided that it is of high energy content.

5.   Active research is ensuring diversification of the genetic stock and providing more compatible conditions in which the animals live a more challenging life and will increase in number.

6.   Although their origin is disputed, the animals have lived in the area for centuries.

7.   Although unrelated animals live in meerkat groups, most are close relatives, individuals whose evolutionary fates are closely linked.

8.   And nobody knows the depth that these animals live at.

9.   Animals living in poor conditions, by contrast, will ever be on the lookout to leave home, abandon their kin and find more promising opportunities elsewhere.

10.   Biologists who have made these animals live longer by genetic manipulation have found that their cells are less likely to die after oxygen-related damage.