Posted: Fri Dec 05, 2008 11:51 am
What you are seeing is called fluttering. Search the forums for it.
Fluttering occurs basically for one of two reasons:
1) The first sign of aggression. As you mentioned, it seems like the one is trying to intimidate the other. Just because there are times of peace doesn't mean that in an instant, one will kill or severely injure the other. When you start to see fluttering, it's generally time to separate the two permanently into two separate tanks. Fluttering can also occur when a tank is too small and there is a competition for resources. How big is your tank and your turtles?
2) The second reason is mating. If you have a male and a female, the male will often harass the female into mating. Once the female tires of his moves, she will attack and injure/kill him. You didn't mention genders, but that one of the turtles is twice as big as the other suggests a female and male pair. If mating occurs, you will have to deal with destroying the eggs or raising dozens and dozens and dozens of turtles. It is best to either separate male/female pairs or destroy the eggs. If you cannot deal with destroying the eggs, you should separate them because RES are overpopulated and it is actually illegal in a number of states and locations to allow the eggs to come to term.
Can you describe your turtles and tank better? Pictures of the front nails of each turtle and the underside of the tail would be helpful in sexing them.
JAX
- - -
Baby Boy - January 9th, 2011! (3 months old)
1 RES - 7" long - Umi (3.5 years old)
1 black lab/hound mix - Josie (1.5 year old)
2 cats - Mysti and Molly (6.5 years old)