Work on the Arun Riverlife project involved cutting trees close to some hedgerows where dormice nest and this work was licensed by Natural England.
In the UK the dormouse has been protected since 1988 by the Wildlife and Countryside Act 1981.
During the tree work, licensed dormice handlers on the WWT Arundel team did daily hand searches of sections to be cut to ensure no dormice were in these zones.
More top news
Holly has your forecast.
Sikhs across the world are celebrating the 550th anniversary of the birth of their first Guru - Guru Nanak Dev Ji.
The chief executive of Demelza Hospice says a shortage of specialist nurses is jeopardising core services, including end-of-life care.