The choice of territory is mainly conditioned by the presence of suitable opposition sites. Its size ranges from 10 to 50 m along the bank, depending on population density. The duration of territory occupation fluctuates between 1 and 15 days. The majority of <5<5 occupy territories for a single day only, some individuals, however, show a strong attachment towards a once occupied area. At temperatures above 26° C 66 prefer to perch on branches, at lower temperatures they sit on stones. The average longevity amounts to 25 days. The longest life span recorded was 60 days (6). The breeding behaviour is described in detail. Copulation and opposition always take place in the 6 territory. During opposition the 9 is guarded by the 6.