I don't know why, but rodents seem perversely attracted to
bulbophyllums. I saw what rats did to a BIG plant of Bulbophyllum
fleitcherianum(? not sure on the name)at the Australian National Botanic
Gardens in Canberra. Pseudobulbs the size of oranges and leaves a metre
long were just what the little monsters were after... and as for what
mice do to stanhopea flowers... the horror...the teethmarks...

At home our defence is an old fashioned one: two irascible cats.