Jack is the elder of Maureen's two boys. Aged 9, he's now in the early throes of chimp adolescence - a time when young males push boundaries and generally annoy their elders (much as human teenagers do!). But Jack's exceptionally laid-back, a very cool chimp. It often seems he's as interested in his human observers as we are in him: he likes to approach to study us, all the better if done from the comfort of a nest made at head-height.
We expect Jack to develop much like his older brother Tom who earned the respect of his peers through calm leadership skills, rather than bluster. Sadly Tom died in 2015 after being injured by a steel trap. If Jack can survive in the dangerous human world at Bulindi, we expect him to increasingly exert his calm and astute influence on the group in the coming years.