• Avian

VHF Avian Tags for larger species

  • Product Type Icon Tag

Highly customised, reliable tags for larger birds and bats.

Our TW series of VHF tags have been used on thousands of projects over decades, facillitating data for researchers around the world.

Decide on the right balance of signal strength, operating life and sensing options, then specify the ideal tag for your study, with expert guidance from one of our Avian Telemetry Specialists.

For species that can take collars, see our VHF collars


  • Attachment: Backpack, Tailmount, Necklace, Legmount
  • Sensing: Mortality, Activity, Posture, Temperature
  • Start-up: Magnet or wire
  • Product Features

    • Strong signal strength for their size
    • Successfully used for decades
    • Choose Tag life versus Signal Strength
    • Many customisations possible to suit the vast array of wonderful creatures you would like to track

  • Product Applications

    While GPS and other technologies reduce labour costs, there are times when those technologies simply don’t work.  For example, if animals do not get clear views of the sky then GPS locations may be infrequent or even unobtainable, or the data may not be transmitted far enough.  Moreover, often you can get more locations by tracking manually for the same weight of tag by using VHF.

    VHF tags allow you to find the your tagged individual in the field which can be important, for example

    1. to be more exact about the habitat they are using, or find out exactly what they are doing there
    2. if trying to find a nesting bird,
    3. to find a freshly dead animal to establish cause of death
    4. or simply to find animals under cover.

    They are therefore ideal for looking at local home-range movements, survival and sociality.

    The traditional beeper VHF has advantages over coded VHF when tracking manually; you can tune to an individual frequency and not have interference from other tags, plus the tags pulse quicker which makes direction finding much easier.  Nevertheless, they can still be logged using our SRX receivers.

    VHF tags require a receiver and antenna to track the tag.

    Case Studies

    Walls S., Kenward, R. and Holloway, G. 2005. Weather to disperse Evidence that climatic conditions affect vertebrate dispersal. Journal of Animal Ecology 74: 190-197.

    Walls, S.S. & Kenward, R.E. 2001. Spatial consequences of relatedness and age in buzzards. Animal Behaviour 61: 1069-1078.

    Kenward, R.E., Hall, D.G., Walls, S.S. & Hodder, K.H. 2001. Factors affecting predation by buzzards (Buteo buteo) on released pheasants (Phasianus colchicus). Journal of Applied Ecology 38: 813-822.

    Kenward, R. E., Walls, S. S., Hodder, K. H., Pahkala, M., Freeman, S. N. & Simpson, V. R. 2000. The prevalence of non-breeders in raptor populations: evidence from rings, radio-tags and transect surveys. Oikos 91: 271–279.




  • Product Specifications

    We can customise these tags to suit your species and study aims.  contact one of our Telemetry Specialists to get the optimal tag for your project.

    Model Weight (g) Life (days) Size (LxWxH) (mm)
    TW-CR2032 6 250 24 x 24 x 15
    TW-10-28 10 550 37 x 17 x 18
    TW-1/2AA 15 1100 40 x 20 x 21
    TW-2/3AA 20 1800 50 x 20 x 21
    TW-AA 30 2100 66 x 20 x 21
    TW-1/2AAx2 30 2100 40 x 30 x 21
    TW-2/3AAx2 40 4500 60 x 30 x 21
    TW-AAx2 65 5250 66 x 30 x 21

    1. Minimum weight. Tags for some species require extra protection or range that can increase the weight.
    2. Maximum life based on pulse length 12 ms and pulse rate 30 pulses per minute at 25°C

  • Product Downloads

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