More than 650 people are taking part in this year’s Durrell Dash.
The two races, of either 6km or 13km start and finish at Jersey Zoo.
Thanks to Jersey Water, runners will be able to rehydrate along the Trinity route without the use of single-use plastic bottles.
Jersey Zoo stopped selling them last year in an effort to reduce packaging and waste.
Alexandra Shears from Durrell says money raised will support the zoo’s new butterfly and tortoise exhibit.
“Just recently we’ve opened our new ‘Butterfly Kaleidoscope’ which is a new exhibit in the zoo where visitors can walk through a stunning and tropical wonderland with free-flying butterflies and tortoises.
“We just opened that last weekend, but obviously with the opening of this new exhibit comes significant running costs, heating, lots of technology, new staff etc.”

Government appoints new Havre Des Pas Lido operator
Jersey Chamber of Commerce 'aghast' at recommendation to reject Strive Hotel plans
Politician calls for Havre des Pas lido tender process to be scrapped
Two Jersey rowers make Team GB
Jersey's rate of inflation rises slightly over summer
Committee calls for Deputy Philip Ozouf's suspension
Baby sloth at Jersey Zoo orphaned as mother unexpectedly dies
DFDS contract reveals termination clause and performance penalties