We have 2 one month old Africans. They go outside during the day as it has been in the upper 80s-lower 90s here. By the end of the day, they have swelling on the sides of their necks. Almost like the neck muscles starting right under the chin has shifted to the side. They don't seem to be in any pain, are eating, moving and doing all else just fine. We are new to geese this year and have a 10 week old African, but it never did this. Am I letting the little ones move too much? They wander all over the yard and will go quite a distance to come to the house when it starts to get dark and they think I have forgotten them. In the morning, the necks look normal again. Any ideas?