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Birds, Bats and Bloodwoods (and Cicadas)

26 Jan, 2010 09:10 AM
The Flying-fox camp on Bellingen Island, which was completely empty as recently as August, is now the temporary home of tens of thousands of bats, drawn to the area from across south-eastern Australia by a mass flowering of Pink Bloodwoods. The last time this happened was in February-March 2007. In 2008 and 2009, for reasons no-one understands, the Pink Bloodwoods failed to flower.

To stand at twilight in a forest of flowering Pink Bloodwoods is an incredible experience. On overcast afternoons, the bats begin to appear well before dark, winging overhead in vast silent squadrons.

Suddenly, one of the animals decides to leave the flock, peeling away and hurtling towards the earth, wings outspread, with a noise like a kite rushing through the air. At the last moment the bat banks and wheels into the crown of a flowering Bloodwood. More and more animals begin to descend; as they drop from the sky they look like fighters out of Star Wars. Soon the whole forest canopy is alive with flapping, squealing flying-foxes, busy feeding and – not that they care – pollinating the trees to ensure a new generation of healthy eucalypts.

Watching birds, on the other hand, can be frustrating at the moment. The cicadas are deafening, just like in the summer of 07-08, and the birds seem to hardly bother singing or even moving around.

The Razor Grinders, Black Princes, Red Eyes and Double Drummers rule the forest. Well, not quite. Hunting the cicadas come large Cicada-killer wasps. On locating a cicada, they sting it (which paralyses but does not kill), then manhandle the heavy insect to their burrow. Once installed in the burrow, the cicada becomes the repository for a single tiny wasp egg. The egg later hatches into a grub, which feeds on the still-living cicada before metamorphosing into an adult wasp.

Only rainforest is exempt from the mind-numbing din of cicadas. Up at Dorrigo National Park, fruit-eating birds are busy cashing in on the summer’s crop of Giant Pepper Vine, and the calls of White-headed Pigeons, Wompoos and unusually large numbers of Rose-crowned Fruit-doves are ringing through the canopy. Nectar-eating birds, on the other hand, do not seem to have been drawn to the valley by Pink Bloodwood nectar in the same large numbers as the Flying-foxes. Possibly the birds are still scattered around south-eastern Australia, busily rearing their young. Lorikeets, Friarbirds and Honeyeaters are present in only moderate abundances, as they have been since spring, when a diverse array of flowering eucalypts (Bellinger and Northern Grey Ironbarks, Blackbutts and New England Blackutts, Tallowwoods, Thin-leaved Stringybarks, Turpentines, Sydney Blue Gums and Smooth-barked Apples) was producing nectar, though not in the same enormous quantities as the Pink Bloodwoods are now.

The Bloodwoods should finish flowering in a month or so, resulting in a drop in Flying-fox numbers, though Paperbarks blossoming in February-March should prevent the Bellingen Island camp from shrinking too much. In terms of fruit, ripening crops of Bangalow Palm berries in gully rainforests will attract parties of Topknot (Flock) Pigeons from now till about mid March. To report any interesting sightings, please contact Brian at Brian.Hawkins@sci.monash.edu.au

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Flowering Pink Bloodwoods light up a hillside near Thora
Flowering Pink Bloodwoods light up a hillside near Thora

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