Yes, you're right buddy, some types of trees really have a bad effect on the health and behavior of hamsters. I don’t know why, but it is not recommended to use fruit tree chips as a bedding! My hamster often had a runny nose and the veterinarian said that the reason was bedding. Then I started looking for the
best hamster bedding and came across the website with reviews for different models. There was a lot of useful information !!! So look for answers there.By the way after buying new hamster bedding my pet became more healthful!