i have a hen about a year old and she seems to have a bad leg we had a close look at her but nothing except the leg looking weak and limp she is struggling to get around and now a weeka nd a day later on of my chicks about 8 weeks old now seems to be suffering the same noticed this morning!!?!?!?! any ideas what i should look for or do? TICKS? i have not had chickens before and am not sure where to look or what for?? HELP!