I have recently been interested in the fact that despite what is generally bandied about, there is no evidence that behaviour is dictated genetically.
There is also increasing evidence that environmental change can lead to behavioural changes which persist even when the environmental change does not. A 2009 experiment with chickens whose lighting regime was controlled in a random fashion caused behaviour to change and this persisted in the next generations without the same stimulus.
This led me to think about events such as the asteroid collision which is thought to have wiped out the dinosaurs.
Mammals became the dominant group. Could this be because they were able to change their behaviour to the new circumstances better than dinosaurs, the new behaviour was passed to the new generations and their bodies evolved to carry out the new behaviour more efficiently?