We have a heap of wildlife carer organizations here in OZ, and you can buy the food for injured animals at most animal stock feed places.
Kangaroo joey mix, insectivore birds mix, grain mash etc.
If they don't stock it they can order it within a few days. Not cheap though...
Reckon Googling "wildlife carer+your town" would be a good place to start.(or similar phrases)
Normally with birds here they are really close to the nest, and once you chase the other bigger birds away that are bashing them up, the mother comes back and leads them home. Normally watching from close by.
Or they are a bit older and have been injured. Hit a car or window. 1 night in a dark box to rest and reset the brain, then they fly away healthy the next day.
Your ID looks pretty spot on to my quick Googling, bit of a pest over here further down south here in OZ.
Good luck with the little fella.
