Sheep photos

Here are some recent photos I like.

This is a yearling ewe, Prancer.

Lambs are getting big.

The photos below are disappointing. I took hundreds (literally) the last few nights when the lambs were running and playing. I think I figured out that my lens isn't fast enough for the low light. The lambs are most active just as the sun is going down and I can't seem to catch the action.

Any advice is appreciated.