Avon & Somerset Police are appealing for spectators with video or photos of the fatal accident to contact them.
The crash happened as 23-year-old cyclist Junior Heffernan came round a bend during the Severn Bridge Road Race.
Here is Acting Inspector Darren Jarvis...
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Six of the small marsupials have been born in the 180-year-old Zoo’s Twilight World and keepers say they are thrilled.
A cloudy night will have drizzly spells throughout and into the early hours.
It will be a largely cloudy night with outbreaks of light rain. There will also be some hill fog.