Ely Wildspace is organising the bird race, which typically takes place twice a year.
Members of the public are invited to meet at the top of Kiln Lane at 7am.
People will split into teams and set off in different directions around the Wildspace to see how many different bird species they can find.
The race is due to end at 10am.
For more information see https://www.facebook.com/ElyWildSpace