The remarkable characteristics of calf development and maternal care in certain animals. They usually give birth one at a time, unlike most other animals which can give birth multiple times. Calves can stand 20 mins after being born and can walk within an hour, unlike us humans who start walking a 1-year-old on average.  They stay up to 16 years with their mother. They don’t eat much but drink a lot of their mother’s milk. Certain animals have remarkable calf development and maternal care, with calves being born one at a time, quickly standing and walking, and staying with their mother for up to 16 years, feeding on their mother's milk.