DO THRUSHES SUNBATHE?

Yesterday was an awful day weatherwise, cold, wet and windy so when I got up this morning and saw the sun shining I was happy. Having my breakfast I glanced out of the patio doors and there on the cotoneaster was a big fat thrush sitting on a top branch all puffed up with the sun shining on his/her breast. I watched him/her for a few minutes and there was not a stir from him/her, so I ask myself do thrushes sunbathe?