Antoine Agasse writes on July 28, 2011, on physorg.com, the article ”Ravenous wolves colonise France, terrorise shepherds.”
He writes, “Regional authorities estimate the French wolf population at between 170 and 200 this year, up from 140 to 170 last year. The government says wolves killed 1,329 animals, mostly sheep, in France this year up to July 22.” (203 days)
This means the wolves killed almost exactly one sheep per wolf a month (if all 1329 were sheep). Estimating the average weight of a sheep at 150 pounds (68 Kg), each wolf should be eating about 4.9 pounds (2.23 Kg) per day.
Gray wolves, Canis lupus lupus, can survive on about 2.5 pounds (1.1 Kg) of food per wolf per day, but they require about 7 pounds (3,2 Kg) per wolf per day to reproduce successfully. Adult wolves can survive for days and even weeks without food if they have to.