I purchased 3 Ole shredders, and the first one was soft inside and my parakeets chewed through it. The second one was so hard that I finally took it out of their cage and tried to saw the sides off, but I finally had to use some big tin snips. Then they chewed it. The third one seemed to be even harder than the second one, and I am in the process of trying to get the outer shell off, but it's very hard. Is there some reason for this? They go through the kabobs in about 4 or 5 hours, so it gets expensive.