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 below shows the average weight for both male and female albatross chicks compared with the 2018/19 Royal Cam chick.
The following graph below shows the average weight of male and female chicks compared with the weight of previous Royal Cam chicks: Moana (2016), Tūmanako (2017) and Amīria (2018).
Note: There are times when we are unable to weigh the Royal Cam chick, so these sections have just been averaged out.