What are these strange holes appearing all over around yard?

[canny1]

 

[canny1]

Hi. Seeing literally hundreds of these all around the house and in the neighbouring scrub whilst walking. Amazed precise these appear to be. Anyone know what they are? Thanks. 

[MitchellMc]

Welcome to the Bunnings Workshop community @canny1. It's brilliant to have you join us, and many thanks for your question about mystery holes.

I'd suggest you check out my answer in this discussion: Holes in soil/yard. Your image of the conical-shaped holes is almost identical, and my best guess would be antlions. They are the larvae of lacewings and create a little conical-shaped death trap that insects fall into and get devoured at the bottom, kind of like the Sarlacc in StarWars. Lacewings are beneficial predatory insects and are especially helpful at removing aphids. So, there's nothing to worry about.

Please let me know if you have any questions.

Mitchell