I have received several replies to my question about mounting transmitters
on crocodile heads, which I will summarise to the list in due course.
However, based on the feedback so far, I think I should provide more
information on the constraints of the study in order to focus people's

These are salt water crocodiles. They range widely and, obviously, live in
salt water.
To get adequate range with the transmitters, the aerial needs to be above
the water. The only part of the animal that is above the water most of the
time is the top of the head and a small portion of the cranial spine.
Internal transmitters have been considered and trialed, but did not have the
required range.

The transmitters are relatively small and light, and can be successfully
attached by epoxy adhesive, but as I explained previously the crocs rip the
transmitter off after a short time. We need something that will stay in
place for 3-4 weeks, longer if possible.

At the moment we still think a combination of epoxy and bone screws is the
answer, but that may just be my bias (orthopaedic engineering is my day
job), so if anyone has any good ideas, we are still interested in hearing

Thanks once again,

Robert Day robert.day@health.wa.gov.au
Project Bioengineer phone +61 8 9224 3227
Dept. Medical Physics fax +61 8 9224 1138

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