Since the 1920's large flocks of starlings have been ariving in Rome between October and February. These flocks can be up to 10 million.
Such a murmeration can produce 7 tons of Guano in one night.
An almost uncountable number of Geese prepare to migrate. Like most swarming creatures they never seem to colide.
The huge swarm comes on land to breed. For the local population it is a supliment to their diet.
Apparently a hamburger sized piece if Lake Fliy burger has 7 times the protien.