Young Collared Dove

Collared doves often nest in our back garden, using a large conifer. About three weeks ago, I was surprised to find half an eggshell. It seemed crazy to be hatching a chick at this time of the year.  A pair of doves were often in the garden.

Now that temperatures have fallen, there is no sign of the adult birds.

This morning I found a chick under the tree. It was barely alive.

I placed in iin a container with a warm, wrapped, bottle  of water, and some bird food.

It is gradually recovering, and shows no sign of injury. It's tail feathers are not fully developed.

I would welcome some advice on what to do next.