Senegal farmers helped by cattle tracker technology
25 July 2014 Last updated at 00:11 BST
Cattle rustling is a common feature of life in sub-Saharan Africa.
It is a crime that has a huge economic impact, but the human cost can be even higher.
In rural Senegal, a project to track cows using mobile phone technology and radio-frequency identification tags could help tackle the problem.
Fiona Graham went to find out how it worked.