Short-distance passerine migrants have two evolutionary origins. Those that have long-distance migrants in the same family, such as the common chiffchaff Phylloscopus collybita, are species of southern hemisphere origins that have progressively shortened their return migration to stay in the northern hemisphere. COUNT 3
QSN1 How many evolutionary origins do short distance passerine migrants have? ANS1 two QSN2 Which species have long-distance migrants in the same family? ANS2 the common chiffchaff Phylloscopus collybita QSN3 Why have some specied progressively shortened their return migration? ANS3 to stay in the northern hemisphere