94 CONTROLLED NATURAL SELECTION 
coloured parents and protectively coloured 
young are to be found widely distributed in 
the animal kingdom. In fact, it is exceptional 
to find parents, bringing up young, which do 
not show this difference in colour or other 
character. Thus are brought together the 
three factors with which Controlled Natural 
Selection can work : 
(1) A society of animals 
(2) Of different value, and 
(3) Having different characters. 
During Natural Selection the less valuable 
and conspicuous parents will be taken, at the 
saving of the more valuable and inconspicuous 
young. The predatory animal will take the 
conspicuous parents that it can best see, and 
leave the young that are only seen with 
difficulty. 
When dealing with Parental Instincts, men- 
tion was made of the displays of colour that 
are made by the parent when the family is 
attacked; they will show their brightest plumes 
to the enemy and endeavour to draw its 
attack ; they will display bright colours which 
are otherwise concealed in wings and tail (see 
Concealed Conspicuous Colours, Chapter ITI). 
Predatory animals, because they have no 
enemies, should not present conspicuous colour- 
