I picked up this trio of silkies yesterday and before I noticed their legs I bought them. They looked fabulous otherwise, but what is this? I saw it today when i was looking for mites and lice and other nasty stuff (they are in quarantine). i dont know why i didnt check their legs yesterday, and now im really kind ticked off at myself. its white, and hard as a rock. any ideas on how to get rid of this stuff?