Speaking of ants, the current David Attenborough series had a bit about ants that had come across on some trading vessel to Christmas Island. They were playing havoc with the local crabs by spraying acid into their eyes then feasting on the blinded critters :(
I carried out a trial for the DPaW using drones to map ant super colonies on Christmas Island. The problem species are Yellow Crazy Ants, which they think came from Indonesia or Malaysia either during or shortly after the first World War (Christmas Island was a strategically significant source of Phosphate). For a long time, they didn't have a significant impact on the island. Rats and cats were doing most of the environmental damage (ignoring the Phosphate mines of course). In their natural environment, they're strongly territorial with each colony fighting for it's share of forrest floor, which is what kept them in check.
In the 90s, something changed. Suddenly, different colonies started to cooperate, and form super colonies. This gave the super colonies a significant advantage, and soon the whole island was infested super colonies, massively increasing the total population of ants. They're now having a significant impact on the red crabs through competition for resources, blinding sprays of acetic acid, and feeding on young crabs. They farm such huge numbers of invasive species of aphids for their sugar rich poop, that they're causing deforestation, which is leading to other invasive weed species expanding.
The project involved carrying out multi-spectral surveys on the forrest canopy (RGB, NIR, LWIR), and then correlating vegetation stress to super colony locations and densities. It was reasonably successful, and there was an intention to go back and use drones to release bio-control agents (Malaysian wasps to control aphids), but unfortunately the government cut DPaW funding, and the project was cancelled.
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