We're all very aware of the danger kangas and other wildlife pose. Plenty of riders won't ride at night because of them, and fair enough.
The "Road Ahead" from RACQ just arrived with a few facts.
Their insurance statistics show the worst danger times being 5:30 to 7:30 PM (and yes, I've seen them at 2:00 AM too) and 5:00 to 6:00 AM. The highest number of strikes occurred between July and September, with August being the peak. These stats are for Queensland. The average animal collision claim in 2013 for cars was $3366.
If you hit livestock, you're on your own. Landowners are not liable. The law basically says livestock have right of way. You are also invited to check every dead roo for joeys, and take them to the Australia Zoo Rescue Unit.