The Warwickshire Wildlife Trust team visited the Hall Gardens last month and used the technology - which is also utilised by police helicopters - to locate the elusive mammals. Torches fitted with red filters were also used during the exercise.
The wildlife trust is currently running a Help for Hedgehogs campaign, aiming to raise awareness about the creatures' declining population and take steps to help the animals locally.
In decades gone by, the animals were abundant across Britain, with around 30 million in the 1950s.
Today it is estimated that there are fewer than a million individuals remaining, which means that there are more people living in Birmingham than there are hedgehogs in the entire country.
The loss of habitat, road deaths and changes in farming methods are all thought to have contributed to the rapid decline.
To find out more about the Help for Hedgehogs initiative, visit the official website.
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