An Eastern Rosella was looking inside a hollow. The bird moved away from the hollow when some Crimson Rosellas arrived. The first bird and another Eastern Rosella combined to challenge the larger Crimson Rosellas. One of the Eastern Rosellas would fly to a branch where a Crimson was, landing beside it, this was all that was needed to make the Crimson fly to a different branch where the behaviour was repeated. It sometimes seemed to be a rolling tussle of flying rosellas through the branches.