The highest rate of mortality for the laughing kookaburra occurs when they are under a year old [2]. A percentage of eggs do not hatch at all due to infertility, genetic defects, etc. Eggs, hatchlings, and nestlings are preyed upon by a variety of species including, but not limited to, the Brush-tailed Phascogale (a bird that licks out the contents of the eggs before they have hatched), rat-sized marsupials, possums, Greater Gliders, and Grey Butcher Birds [2]. Fledgling laughing kookaburras that have just left the nest are given constant parental care and so do not fall prey to other animals very often [2]. Fledgling who have learned to feed on their own, however, do sometimes become the prey of cats, fox, and other predators [2]. As for adult kookaburras, the larger individuals tend to survive longer in the wild than smaller ones [2].