With the right Fresnel lens & "blinders" you can get just about any detection pattern you want. Check the specs for various lenses at http://www.fresneltech.com
So many exotic mammals etc. have been introduced in Australia, no animal being there would surprise me - it's really one of the most disgusting examples of "bucket biology" being practiced on a continental scale.
On that note, I saw a hunting ad for Australia where you were allowed 1 camel, 1 zebra, and unlimited Jackasses and feral pigs per day. They had a whole list of animals you could shoot for extra money. Sounds like our local zoo, but the zoo doesn't cost 3 grand a visit!!