Yes, in most if not all birds flying south is an instinctual, inherited behavior.
In fact someone recently did a study in Europe which found that this fact is contributing to a possible speciation event, some birds, which have found a food source in Britain in the winter, are arriving in mating grounds sooner and are passing the trait of going on to Britain along with other traits, to their young. This slowly causes a divergence of populations which may eventually become separate species.
http://scienceblogs.com/notrocketscience/2009/12/british_birdfeeders_split_blackcaps_into_two_genetically_dis.php
Birds flying south for winter IS a instinct
inherative behavior
Migrates
They don't stay when it is snowing. Hasn't anybody learned that birds fly south in the winter?
the Canadian goose flies south because of winter
monarch butterfly
The Upland Sandpiper is found in the everglades as it flies south to South America for the winter.
typically all insects disappear in the winter and live in warm to hot climate in the summer. its almost like the birds flying south for the winter! lol
Do cranes migrate south for winter
winter
the north learned that they weren't invincible and the south learned that they can win battles
Well south for the winter in were animals go for a warmer climate so depending on where you live where ever south is south for the winter so say you live in Kansas south might be Oklahoma or texas or reigions lower than that
South Carolina's winter climate is the average of 69oF ands 16oC
The flip line of seasons is the equator. So Winter in South America is during Summer in North America. June - September = Winter in South America.