Is putting foam in hamster cages safe?

No, putting foam in hamster cages is not safe. Hamsters are curious and like to chew on things, and foam can be easily chewed into small pieces that hamsters can choke on. Additionally, foam can absorb urine and other liquids, which can create a breeding ground for bacteria and lead to health problems in hamsters. Using appropriate bedding materials like Aspen shavings, paper bedding, or timothy hay is a much safer option for hamster cages.