My Russian occasionally does that too, but it is just a way of getting rid of extra protein. (Nothing to be worried about)
[THUMBS UP SIGN][TURTLE][TURTLE][TURTLE][TURTLE][TURTLE][TURTLE][TURTLE][THUMBS UP SIGN]
Those look to be normal urates. Tortoises and some other reptiles and all birds excrete urates. These are the end-product of their protein metabolism. These aren't really 'extra proteins' as much as all the stuff that is left over after processing protein.
Just to be a biochem nerd... urates are made up of carbohydrates with oxygen, nitrogen and hydrogen on it. Probably more than you wanted to know...