http://blackmold.awardspace.com/aspergillus.html read this :( lol not great but sometimes it sounds eh, others kinda scary, worried my cat may have problems,
I know this is old, sorry to revive it, hopefully someone sees this soon. I have had my kitty for about 3 months now, and have used worlds bets cat litter the whole time, never had a problem, in fact the litter box in the kitech (not covered is fine) however I noticed recently (maybe a week...
I think that is mainly a safety thing so they don't "get the taste" that or a liability / protestors thing since the zoo's are not like someones individual home, and is for profit usually. of course then look at how sea world did their orcas in