Crews from Alfreton and Ripley wearing breathing equipment hosed down the fire.
The members of the county lines gang admitted supplying drugs in Derby and Amber Valley.
A zoo once housed monkeys and a bear named Little Roosevelt before it shut due to World War One.
Mowing will be reduced in places such as Alfreton, Belper, Heanor and Ripley.
Two police call handlers passed on information to their criminal boyfriends, a court heard.
Seven cattle were taken from the Ripley area on Sunday, police say.
The seven cows have been recovered and are being returned to a farmer in Ripley, police say.
Entrepreneur John Marshall operated a zoo in Ripley, Derbyshire, between 1908 and 1915.
Martin Davis weighed more than 27 stone, but has transformed himself over four years.
