Topics from the Wolf Project Annual Report include pup survival, wolf pack summaries, and using radio collars to study wolves. Doug Smith, Yellowstone Wolf Project leader says, “In 2018 we noted a drop in pup numbers, however there were no intra-species wolf killings, which is usually the reason for the most wolf mortality. This year marks a 10-year period of relatively stable wolf numbers. While the reasons for this are unknown, a relatively stable elk population is likely a large factor.”.