How much can a koala bear?

For those of my readers with access to today’s Adelaide Advertiser newspaper, there is an amusing sequence of photos of a ‘crow’ (probably a LIttle Raven) harassing a koala.

I’ve seen this type of thing with other species, including an Australian Magpie. On another occasion I witnessed a honeyeater pulling out tufts of fur from a sleeping koala, obviously to line a nest.

The photos have been posted here, but the link may not work after a few days - I’m not sure how long such items remain on the site.