I have a sebbie that appears sick. I have 3 goslings I got about 2 months ago. All three were doing great. I noticed last night that my white gosling is unsteady on her feet. She is only about half the size of the other two (well a little more than half but still smaller). She nibbles at food but does not eat much but she does drink. I was reading it could be worms.. What do I worm with and how much? Any help of suggestions would greatly be appreciated.