Starling photography with a D500
I'm looking for some advice.
I spend weekends watching Starling murmurations.
There are some superb photos all over the place.
i am looking to take better photos, and want to know peoples opinion on the best lens to use to photograph large flocks of them. They can occur twice a day once as they leave their roost just after sunrise (Little known), and maybe 30 min before sunset. My opinion is this is similar to bees telling the rest of the hive (or roost) where the food is.
Fixed or Zoom, Sigma or Nikon Prime. (Money no object).