Snow geese are migrating now!

There are a lot of birds migrating annually. 

Can you guys give me some examples?  Why? How?

Daddy is thinking of taking you guys to see those migrating birds.  :-)
http://www.portal.state.pa.us/portal/server.pt?open=514&objID=613318&mode=2
http://www.portal.state.pa.us/portal/server.pt?open=514&objID=621427&mode=2
http://www.portal.state.pa.us/portal/server.pt?open=514&objID=1891765&mode=2