In their 1979 article, Harrington and Mech recorded significant differences in the response rate of wolves at three types of sites.
| Type of Site | Number of Responses | Number of Attempts | Response Rate |
|---|---|---|---|
| Non-rendezvous site | 293 | 984 | 29.7% |
| Kill site | 24 | 33 | 72.7? |
| Rendezvous site | 128 | 166 | 77.1% |