Thats great info Jackie thank you - I wonder why this would happen. It must be linked to how the breed perhaps? As not really many other insects in the mix, just millions of these all up and down the beach...... and the beach is over 50kms from the fire - maybe closer to 100 - but the tide mark is filled with ash and the water is as well. This is what made us assume the bushfire was what killed them as they were in amongst the ash.
You’ve got a mix of Coccinella transversalis (Transverse Ladybird) & Hippodamia variegata (Spotted Amber Ladybird/Variegated Ladybird) in the same photo so I can only Verify it as Tribe Coccinellini which includes both of them😊