1.   Although adults reproduce in reservoirs, young do not survive due to a lack of suitable food items and predation by non-native fishes.

2.   Lungfish at Enoggera did well breeding when there was water hyacinth, but since the plants were cleared, Kemp says no young have survived.

3.   The pheasants lay a dozen or so eggs, but only three or four young survive.

4.   Researchers generally believe that monogamy originated among species whose young survived best when raised by a bonded pair.