Comparing the intelligence of different species is a complex task, as there are many different ways to measure intelligence. Some factors that can be considered include problem-solving abilities, social intelligence, communication skills, and tool use. Based on these factors, it is difficult to say definitively whether kangaroos or parrots are smarter. Both species have their own unique cognitive strengths and weaknesses.
In general, parrots are considered to be more intelligent than kangaroos. This is because parrots have a larger brain-to-body ratio, which is often associated with higher intelligence. Parrots also have a more complex vocal repertoire and are able to learn and imitate human speech. However, kangaroos have their own unique cognitive abilities, such as their ability to navigate long distances and their complex social behavior.
Ultimately, the question of which species is smarter is a matter of debate and there is no clear consensus. Both kangaroos and parrots are fascinating animals with their own unique cognitive abilities and behaviors.