Include

[Nikki_Elmo]

1. it sucks all of the moisture
2. Respiratory problems due to excessive dust, particularly common with snakes/lizards that dig underneath it.

3. Possibillity of pieces getting stuck in the snakes mouth, or consumed then causing impaction.

4. It encourages people to 'spot clean' instead of disinfecting the cage thoroughly. Often urine will soak through to the floor and will be absorbed by pellets which are then left behind when cleaning. Also, most people won't bother to disinfect the floor, they just scoop and replace leaving all the bacteria behind. This is a very bad practice.

5. It is often hard to notice when your snake has relieved itself, especially if it has only urinated and even moreso if the cage has a lot of decorations (eg. fake plants). You should see what the result is if these urine soaked pellets are left in a cage for several weeks/months!

6. Although not usually as serious as the abovementioned, another problem i came across was when my White's Skinks who through the course of digging/burrowing in it, would fill the water bowl up with pellets, which would quickly suck up all of the water, leaving you with some thirsty lizards!

7. I have also heard stories of people finding staples and other such things in their pellets which obviously can't be good.

8. Mites love it!