[Ethology of the taiga tick Ixodes persulcatus during its spring activity].

10 elementary behavioural acts (EBA) were distinguished in the behaviour of the taiga tick during its spring activity. The acts include repeatable and indivisible into more simple forms poses (active and passive waiting poses, resting pose, hiding pose), movements (scanning movement, Haller's organ cleaning, contacting movement) and locomotor acts (locomotion to a zone of contact, locomotion to a shelter, locomotion to a source of scent). EBA form 3 behavioural programs: entering a zone of contact, moving to a shelter and attacking a host. The first two of the programs are turned on by processes of water loss and uptake in the organism of the tick, the third program--by signals of the host. The system of describing of ticks behaviour, offered by the author, can be used by investigators dealing with the ethology of ticks.