Composition of wolf diet was assessed based on scat samples collected in Alpe di Catenaia, Italy.

aScat samples per year sum to the total number of samples used in all analysis over 9 years (1,974). Scat samples per prey item are defined as the total number of scats found containing that prey item in any proportion and may, therefore, sum to more than the total number of scat samples collected.
bFor analysis purposes our data years began in May and ended in April; the 2000–01 year represents all scats collected between 1 May 2000 and 30 April 2001.