"Morse and Figliomeni unpacked their boxes, filled with thousands of frozen sausages they produced at a factory south of Perth, according to a recipe developed by a man they jokingly called Dr. Death."

"It called for kangaroo meat, chicken fat and a mix of herbs and spices, along with a poison — called 1080 — derived from gastrolobium plants and highly lethal to animals, like cats, whose evolutionary paths did not require them to develop a tolerance to it. (The baits would also be lethal to other nonnative species, like foxes.) As the sun brightened the brume, the baits began to defrost. By midmorning, when Morse helped load them into a wooden crate inside a light twin-engine propeller Beechcraft Baron, they were burnished with a sheen of oil and emitted a stomach-turning fetor. The airplane shot down the runway and lifted over the gently undulating hills of the sand plains that abut the Indian Ocean. Rising over the mantle of ghostlike smoke bushes that carpeted the ground to the treeless horizon, the plane traced a route over the landscape, its bombardier dropping 50 poisoned sausages every square kilometer.... Dr. Death, whose real name is Dr. Dave Algar and who is the principal research scientist in the Department of Biodiversity Conservation and Attractions for the state of Western Australia, told me that he began developing the recipe for the poisoned sausages by examining cat food in supermarkets and observing which flavors most thrilled his own two cats. As Morse said: 'They’ve got to taste good. They are the cat’s last meal.'"

From "Australia Is Deadly Serious About Killing Millions of Cats/Feral felines are driving the country’s native species to extinction. Now a massive culling is underway to preserve what’s left of the wild" (NYT).

The highly rated comments at the NYT support what Australia is doing. Example:

We used our yard to create an environment for native birds and insects. It worked. Our land was a perfect habitat for many species of birds, both local and migratory. Until our neighbors got two cats. Six years later I have only the nuisance birds (English sparrows, starlings, ring-neck doves) nesting in my yard. The ground-nesting birds haven't fledged babies since the cats were turned loose to pillage. Not only do they destroy birds, but gardening for food is also now difficult because they defecate in my raised beds. I have had to kill baby bunnies left gutted on my doorstep because the neighbors' cats have decided to 'treat' me. The owner says they bring in dozens of dead and dying birds, lizards, small mammals and snakes every week. Cats that are allowed to roam are a scourge. Australia has it right.

AND: Another NYT commenter:

If there were millions of feral dogs roaming the USA in packs, attacking deer, turkey, water fowl, mammals like raccoons and opossums, and other game and native wildlife, you could be darn sure we would be hunting them down.

BTW: there ARE millions of feral cats roaming the USA, killing millions of song birds every year. Why are we letting that happen? Because cat people are totally unrealistic and rather difficult to deal with!