Horse
Depending on breed, management and environment, the modern domestic horse has a life expectancy of 25 to 30 years. Uncommonly, a few animals live into their 40s and, occasionally, beyond. The oldest verifiable record was "Old Billy", a 19th-century horse that lived to the age of 62. In modern times, Sugar Puff, who had been listed in "Guinness World Records" as the world's oldest living pony, died in 2007 at age 56.
Free-roaming horse management in North America
Free-roaming horses on the Eastern Slopes of the Rocky Mountains in Alberta are known locally as the Alberta Mountain Horse or "Wildie" (). On November 1, 2014, the non-profit advocacy group Wild Horses of Alberta Society (WHOAS) entered into a five-year agreement with the Alberta provincial government's Alberta Environment and Sustainable Resource Development (ESRD). This agreement authorized WHOAS to effectively and humanely manage the feral horse population in a 490 km2 portion of the Sundre Equine Zone on the Eastern Slopes. By November 2017 WHOAS had completed the first three years of a selective contraception program using Zona Stat-H, a form of Porcine Zona Pellucida vaccine, or PZP. WHOAS has vaccinated approximately 82 mares by free-range field darting, some of these mares have received booster shots. With one shot a mare is 70-80% less likely to conceive for the 1st year, depending on the time of year in which she is vaccinated. This increases to 90% with the administration of a booster shot. The contraceptive effects wear off with the chance of conception increasing every year post-vaccination. WHOAS also runs a 20-acre horse rescue facility west of the Town of Sundre for those horses that run into trouble and have to be removed from the wild. The rescue facility will also take in orphaned foals to be raised, gentled and adopted out. In early 2018 the Alberta Government agreed to consider proposals from other not-for-profit groups to conduct PZP contraceptive programs in other areas of concern to maintain the population at manageable levels. If successful, these programs will replace Government captures and culls.