However, neither of them leads to
any change in behaviour. Therefore, the most powerful results are
from the remaining two treatment groups where, according to
the hypothesis that zebra finches can associate the type of nest
material with their breeding success, there should be a change in
behaviour. Thus, males who were allowed to build with their
preferred colour of nest material but had an unsuccessful breeding
experience would be expected to reduce their preference for that
colour. This was not the case.