Chestnut backed Thrushes( Zoothera dohertyi) still in nest.

Yes I had late nests a couple of years ago from Cape Robins and they had rickets . These were outside at this time of year and shortening of day light had an effect .
Also dusting livefood on every feed is important plus gut loading your livefood as well .
By late August most foreign birds have started a moult and changing their habits . I breed indoors as well as outside and even though I can control lights and heat I still force a moult and change the diets by mid September .
There is the odd pairs of birds that buck the trend but it is quite rare .
Best of luck with the Chestnut Backs next year . They are my favourite Thrushes
Kept the first ones in the UK way back in 2003

Was not intending for them to breed again. I had switched them to Just unikomplet pellets and was surprised to find the female sitting. The three young fledged (one drowned in a shallow dish ) I tried hand feeding one youngster but it died after about a week , I took the parents and one youngster out of the aviary and put them in a cage. ( I will separate them tomorrow) they continued to feed the youngster . It is now feeding itself I have been giving it white mealworms dipped in calcium powder . It can hop around and feed itself but it is not going to be any good for breeding. I was worried that I would loose the mother due to calcuim deficency but she seems fine ( she is now an old bird)

Chris