 Towards the end of that same month she left for a trip around the Bass Strait Islands, visiting Flinders, Fisher, Great Dog, Little Dog, Woody and Isabella.She later visited these Islands again in December 1958, with the addition of Tucks, West, East and South Spences, Little Green, Penguin Islet, Apple Orchard and Samphire.On 25 April 1958 Gillham then set out for a visit to Phillip Island, to see and learn about the koala bears on the Island and the penguin colonies at Phillip Island Nature Park, or 'Penguin Parade'; visiting the Island again later that year in October to collect penguin guano for the Microbiology Department at University of Melbourne.