|Hawaiian monk seals|
Now, monk seals don't have have the same sort of problems when it comes to dispersal as lemurs and the like do. Given time, they can just swim across vast stretches of ocean, feeding on fish as they do so. The apparent puzzle of their wide separation is also reduced by the fact that there used to be a third species, living in the Caribbean, which sadly went extinct in the late 20th century. The Caribbean is about half way between the other two locations, and that helps rather more than you might think at first glance.