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    Home » Travel

    A Large Australian Bat - the Grey Headed Flying Fox

    Published 20 February 2013 by Liz Gardner | Leave a Comment

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    While taking a quiet evening walk along the river bank, in the trees overhead there was a flurry of movement accompanied by squealing sounds as hundreds of flying foxes took to the sky – what a surprise ! These fascinating creatures have been evidently living in some of the trees on the banks of the Mitchell River in East Gippsland, Victoria, for  years – and according to a recent newspaper article have been around the Bairnsdale area since 1882.  This species was identified as Pteropos poliocephalus or the grey-headed flying fox (bat).

    Australian Flying Fox
    Australian Flying Fox

    Having never seen these bats up close before it was interesting to watch them: during the day; and later around dusk as the light was slipping away, thousands of these flying foxes flew over the house where we were staying - very low, just above roof top level – silent and fast (35 kph) like a squadron of stealth aircraft.  Amazing to watch.

    Fascinating information about the Flying Fox a large mammal

    • They suckle their young and fly with them for the first months of the young bats life
    • They camp in colonies of thousands
    • Their diet is primarily fruit and blossoms (much to the distress of the local apple orchardists)
    • The bats nightly feeding flight range is 20 to 50 Km
    • Bats are very vocal with about 20 different calls
    • The odor is from the glands of the male bat (and not feces)
    • This is the largest bat species in the world
    Flying foxes during the day
    Flying foxes beside the river during the day

    Flying Bat Diseases & Climate Change influences

    Bats are very clean mammals but some species of bats carry a virus called Lyssavirus (rabies) infection (from handling sick bats) and Hendra virus which can pass to horses through its droppings and the virus may also pass on to humans.

    Climate change is influencing distribution of species in Australia including bats and some bat colonies have moved hundreds of kilometres south in recent years.

    This particular bat colony was beside the river (for cooling effect) but the temperatures during our stay were in the 30's and 40's topping out at 42.3 degrees Celsius on one day.  I wonder if that is why we saw dead bats on the ground the day after this very hot day.

    Dead bats found under trees the day after 42 C plus temperatures
    Dead bats found under trees the day after 42 C plus temperatures

    This may not be your traditional tourist venue but we were fascinated by these bats as we went for our daily walks along the Mitchell River ~ definitely unforgettable !

    Notes

    • A fruit bat is called a “megabat”
    • Flying foxes can have a wingspan of up to one metre or more
    • There are 950 species of bats in the world – 75 species in 7 families in Australia
    • The smallest bat can weigh two grams (a bumble bee bat)
    • Bats hang upside down because they fly and they cannot stand on their feet
    • Mammals are warm-blooded, give birth to live young which they suckle for 6 months
    • Bats can be cave dwelling but generally tree-dwelling creatures and sometimes home dwellers
    • Bats are not blind but emit high frequency bat calls which provides bats with information on location of food and objects
    • Bats are a symbol of long life and happiness (especially to Chinese Australians)
    • To the Australian aboriginal they are simply “good bush tucker” (food)

    Flying foxes during the day

    References & Links

    • “Australian Bats” Sue Churchill, New Holland Publishers, 1998
    • “Climate Change” CSIRO, P. Holper and S. Torok
    • Rabies and Australian Bat Lyssavirus Infection
    • Fruit bats are the natural hosts of  Hendra virus - WHO
    • Hendra virus in news
    • A video on fruit bats

    Updates

    March 11, 2013 - sadly it would seem that the Bairnsdale flying foxes found dead during our recent Australia trip, most probably died from heat stress from the previous days record high temperatures in the low 40's.  See article by J. Hayes, ABC, "Heatwaves to hit Wildlife Hard" 

    January, 2014 - 40 degree plus weather kills tens of thousands of flying foxes in Australia's recent heat wave

    May, 2014 - flying fox numbers increase in Bairnsdale, Australia

    The Heat Wave in the Summer of 2018-19 was a disaster for the Flying Foxes.  Record heat waves with temperatures in mid 40's to low 50's C caused heat stress deaths in an estimated one third of all Flying Foxes with thousands dying in Adelaide, South Australia, Eastern Victoria to Queensland in northern Australia :
    ~ January 28, 2019:  Flying Foxes die from heat stress in Bairnsdale, East Gippsland  

    "... temperatures exceeding 42 ºC cause mass mortality among flying-foxes at near biblical scales, with profound effects on the behaviour and ecology of the species. These extreme heat events affect some flying-fox species more than others ..." ~ Animal Ecology Lab (2006)

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