@synduckate that's a good question!
From my experience wallabies are a lot more flighty compared to kangaroos. They're small and very easily scared if you make too much noise around them or get too close. Kangaroos are usually double the size of a wallaby and able to defend themselves against larger animals with powerful kicks so I've found roos tolerate people much more than wallabies do mainly because they know they could kick our ass if we tried something 😅