Question

What is a specific example of an invasive species being introduced to kill off another invasive species?

Answer 1

The Cane Toad was introduced in Australia to control the native Grey-Backed Cane Beetle.

Explanation:

The Grey-Backed Cane Beetle was a threat to sugar cane crops. The Cane Toad was introduced in Australia in 1935 to control the Grey-Backed Cane Beetle, whose Larvae ate the roots of the Cane plants.

Cane toads are poisonous, and many native animals in Australia eat frogs. When the Cane Toad was introduced, native animals ate them and died. There are now endangered native species because of the introduction of Cane Toads.

https://en.wikipedia.org/wiki/Cane_toads_in_Australia#Introduction_and_spread
https://www.pestsmart.org.au/pestsmart-case-study-introduction-of-the-cane-toad-to-australia/