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We've had our turtle Davey for about 1.5 years now and he has begun to do a strange dance as if he is chasing his tail like a dog. It doesn't appear to be irregular swimming because when we walk up to him he just swims up to us and begs for food. What gives?

What kind of set-up does Davey have and how big is he(shell length from tip to tip not including curve)?

If there's no irregular or lop-sided swimming involved he could just be playing, but I've not heard of any turtle doing this, but they can do some pretty cute/silly things. Maybe someone else can shed a little more light on the matter for you.

How much water is he in and how often is he doing this spinning thing?

Is he swimming backwards? Mine do that from time to time.

well he's in a 20 gallon tank and he's about 4 inches in shell length. the tank is filled about 17 gallons. he did it again today.

He hadn't done it since you first posted about it (a week ago)?

I catch him doing it about once a week. He might do it more. Again there is no unordinary swimming, it just seems that he likes to chase his tail.