One of my favorite pictures. This is a fledgling from a local animal rehab.

Despite their initial diminutive size, the baby owls grow at an astonishing rate, increasing their weight from around 30 to 50g to about 1kg within just 25 to 30 days! This equates to as much as 30 to 33g (approx. 1 oz) per day. Weight gain slows after 30 to 40 days or so.