I have noticed many threads concerning extremes folks go through to ensure birds have more or less continous access to liquid water when it is very cold out. I was wondering if anyone tried usind crushed ice? My birds can easily meet water needs by consuming snow but have considerable difficulty when trying to chip with bill frozen water in bowl. They can meet needs for good health by drinking for only an hour or even less in morning but such limited access can reduce egg production. The crushed ice might be more effective than only access to liquid water for short period.