I was at a local park looking for subjects to photograph. They have some trails through the woods and a large 2.5 acre pond. There is usually a pair of Mute Swans in the pond. I did not see any at first, but then one of them appeared on the far side of the pond and eventually came fairly close to where I was. These were shot with a m43 camera with a 100-300mm Panasonic lens. So in Full frame equivalence, that is equal to 200-600mm, quite a bit of reach in a small lightweight easy to carry setup. It is surprisingly sharp if you are careful. Still prefer my standard Canon gear, but sometimes I just do not want to carry it all!
Assorted portraits and views at various focal lengths up to 300mm, depending on the distance of the Swan from me.