This is interesting as these caterpillars have warning-type coloration and are not eaten by most birds. They can crawl unmolested across paving at Canberra Airport where there are magpies and ravens
on the lookout for food. The cuckoos are either resistant to distasteful or poisonous compounds or the caterpillars are sending a fake signal with their warning coloration which fools most other birds. Many cuckoos also eat hairy caterpillars (which may have
stinging hairs) which they mash up first, so perhaps they have found a food source less exploited by other birds.
Alison R
On Monday along the Molonglo River, 2 Horsfield Bronze-cuckoos were enjoying the many succulent Pasture Day-moth caterpillars crawling around on the ground.
Cheers
Nicki Taws
