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Adulthood

Adulthood is the stage of when physical and intellectual maturity have been achieved and this differs between species. In humans, adulthood is thought to be around 20 or 21 years old and is the longest stage of life, but in all species it ends with death. In dogs, small breeds (e.g., Yorkshire Terrier, Chihuahua, Cocker Spaniel, etc.) physically mature faster than large breeds (e.g., Saint Bernard, Great Dane, Golden Retriever, etc.), so adulthood is reached anywhere from 12 to 24 months or 1 to 2 years. In contrast, many insect species have long larval stages and the adult stage is only for reproduction. The silkworm moths don't have mouthparts and don't feed, so they have to consume enough food during the larval stage for energy to survive and mate.