The clicking noise is an extremely powerful super-suck!!! they use this to extract the juicy bits from snail shells which correct me if I am wrong is one of their main food sources in the wild. If you put some in you may get to see them do it, I have only seen them do it on empty ones they have already eaten, I suppose you would have to sit up all night to catch them doing it.
Mine did it too, but mainly when they got the algae wafers....which wasn't for them but the two plecos.
Still though EVERYONE would be in a frenzy for them so I'd wind up dropping like 4 in there at a time so the plecos would at least get a chance at their dinner!
Mine freaked me out when I first heard them. It sounded just like cracking glass or something was kinda grinding against it like with sand. Very scary for a fish tank!
I've been to whales.... does that count??? lol. I stayed in a swanky hotel/castle thing for 3 days on a tour around england/wales. Might have been in cardiff. I'll have to check my travel itinerary.
Those spiny things are cool. They look like they could do some damage!
Yuppers, they all have them. it shocked me the first time I ever saw that pic. If you look closely under their eyes you can actually see them when they're lying down (the spines)
(by the way,this topic is over a year old, what a bump!!)