Blue Tit - Cyanistes caeruleus

 Photograph at Cannop Ponds, Forest of Dean, Gloucestershire, Britain..

Brown Rat - Rattus norvegicus

 Photographed at the Stone Works, Cannop Ponds, Forest of Dean, Gloucestershire, Britain.

You like them or loathe them, they are natural.

Brown Rat juvenile

Immature Silver Gull - Chroicocephalus novaehollandiae or Larus novaehollandiae

 Photographed by Pete, my brother, in Australia.

Patagonian Mara-Dolichotis patagonum

 

And now, the adult version Patagonian Mara.

Patagonian Mara juvenile - Dolichotis patagonum

 Photographed at the Amazona Zoo, Cromer, Norfolk, Britain.

Looking like a cross between a huge rabbit and a small deer.