The trees of the Box-Ironbark forest produce a lot of flowers and nectar. They are a major source of nectar and pollen for honeyeaters, lorikeets and many kinds of invertebrates. Flowering of the different species of eucalypts takes place at different times of year so there is always a nectar or pollen source available for migratory, nomadic and resident birds. This means there are both more species, and greater numbers of individuals, of honeyeaters and lorikeets than in any other ecosystem. These birds include Black-chinned, Regent, Fuscous and Brown-headed Honeyeaters, Swift Parrots and Musk Lorikeets. The forest supports the largest numbers of Eastern Grey Kangaroos in Victoria and is a stronghold for Brush-tailed Phascogales, Yellow-footed Antechinuses and Squirrel Gliders.