The underwing of a fieldfare is light grey in colour with a small patch of white near the body.

This bird is called a fieldfare.

I believe Pilaeria is a term relating to a species of orchid, possibly similar to Cleisostoma.

Pilaria is a genus of crane fly, of the Limoniidae family.

Pilaris, or Turdus pilaris, is the scientific name for the fieldfare, a bird of the thrush family.

Yes. There are many.

In the winter we have Whooper Swans, Bewick's Swans, White-fronted Geese, Brent Geese, Pink-footed Geese, Bean Geese, Fieldfare, Redwing, Brambling and other visitors.

In the summer we have Swallows, House Martins, Sand Martins, Swifts, Terns and many types of Warblers.

Carrion Crow, Mute Swan, Lapwing, Pied Wagtail, Tawny Owl, Wood Pigeon, Kingfisher, Mallard, Egyptian Goose, Grey Heron, Fieldfare, Redwing, Redshank, Lesser Redpoll, Stone Curlew, Red Kite, Bleck-headed Gull, Cormorant, Puffin, Gannet, ...