We use size, weight and temperament of the chick to guess the sex. Male chicks usually become heavier and larger than female chicks at around 80 days old, although we won't know for sure until the chicks begin to breed, around the age of 10.
The following graph shows the average weight for both male and female albatross chicks. It compares both Moana's and Tūmanako's weights with the second 2017/18 Royal cam chick.
The graph below compares both Moana's and Tūmanako's weights with the first 2017/18 Royal cam chick.
Note: There are times when we are unable to weigh the web cam chick, so these sections have just been averaged out.