Macaroni penguins are one of the most abundant penguin species but have suffered dramatic population declines. Understanding the ecological pressures they face helps target conservation and welfare improvements.
Wild macaroni penguins face welfare challenges from food scarcity when krill availability shifts with ocean warming, predation from introduced species on breeding islands, and bycatch in fishing nets. Individual birds experiencing food shortage reduce body condition before and during breeding, with potentially severe outcomes for chicks that depend on regular food deliveries. Introduced predator eradication on breeding islands has demonstrated dramatic improvements in breeding success and juvenile survival, representing one of the highest-impact welfare and conservation interventions available.