Imprinting e. Habituation 15. Songs of oscines are learned , whereas songs of sub-oscines are innate . Sub-oscines have more complex songs than oscines. Songs of oscine species consist of more dialects than songs of sub-oscine species. Critical periods usually occur at an early stage of development.
Endogenous factors are important in determining onset of the critical period.
Behavior developed during the critical period is usually irreversible later in life. Length of the critical period differs between individuals of the same species. The correct answer is d . Use the following information to answer questions 9 and 10. All of the above 18.