Keep an eye out for the beautiful Blue Tiger butterflies – Tirumala hamata visiting the mountain at the moment. Note the tiger like spots on the head.
When I could not identify any caterpillar (larval) food plants in the Reserve for these butterflies I contacted Dr Carla Catterall who kindly shared her extensive knowledge. It turns our Tigers are tourists just visiting Brisbane on holidays.
Dr Catterall advises that the Tiger Blue is a migratory species – so to 
understand why we are seeing them we need to search for info about its migratory habits rather than its food plants.
Because of these large-scale coordinated movements by many individuals at once (which are poorly understood), this species appears and disappears in large numbers from time to time (and apparently there are a lot of them in the Brisbane region at present). It is also known to migrate over water (for example, I [Carla Catterall] have seen them flying across the ocean between Gladstone and Heron Island).
The larvae would have hatched, fed and pupated somewhere else, probably a long way away from Toohey Forest (tens to hundreds of km).
Thank you Dr Catterall.
Mount Gravatt Environment Group 
January 21, 2011 at 12:38 am
We used to live at Upper Mt Gravatt and I’m sure these are the butterflies that used to come around in big groups and hang around our Campherlaurel tree. There was definately a pattern to their movements as you wouldn’t see any for ages and then they would come back.
January 23, 2011 at 10:59 am
It may have been the Blue Tigers Bree or very likely the Blue Triangle butterfly.
The camphors are a caterpillar food plant for the Blue Triangles. However the camphors are a weed tree so we are planting Hairy-leaved Lollybush (Clerodendrum tomentosum) which are Blue Triangle caterpillar food and also indigenous to Mt Gravatt Reserve.