Females with calves tend to use the shallow waters near the shore of your Rincon Sandy Beach Vacation rental for breeding and their feeding grounds. This is thought to be to reduce predation and to avoid being bullied by males. Several males can display aggressive behavior when competing for access to a female as females do not mate with the same male. Males are not monogamist and join females from different feeding grounds. and can be seen from your Rincon Surf rental. Calves range from 9-15 feet and weigh 1-2 ton at birth. Calves in both hemispheres are light grey at birth and darken during the first month of life. Mothers separate from their calves 10-11 after birth, sometimes calves are seen with their mothers longer.