Bogong moth tracker launched in face of 'unprecedented' collapse in numbers

New website asks Australians to record sightings of insect that is main food source of the mountain pygmy possum

Every spring, 4.4 billion bogong moths migrate up to 1,000km to the alpine regions of Victoria and New South Wales ahead of the summer heat.

But for the past two years, the number of moths that have made the journey to those areas from breeding grounds in Queensland, NSW and western Victoria has crashed to almost undetectable levels and scientists are turning to the community for help.