Kiwi hatching at Kiwi Encounter

I couldn't believe my eyes when I saw this chick pipping out of it's shell! Can you estimate how old this chick is?

Kiwi Encounter in Rotorua candling the eggs

Candling the egg

"Candling" means shining a bright light into a kiwi egg to light up whats inside. This tells if the egg is alive and how old it is.