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Added later: A beetle looking over the edge of the leaf, perhaps? Are they antennae or the front legs?

Found the answer …
Wikipedia

The Lycidae are a family in the beetle order Coleoptera, members of which are commonly called net-winged beetles.

and from John Tann, Flickr

‘Net-winged Beetle, possibly a species of Porrostoma, family Lycidae. Como NSW Australia, November 2011. ‘  [later identified as a Red Shoulder Lycid beetle]