Organism is saved from extinction has increased in numbers beyond the capacity of the ecosystem to sustain such numbers.
Culling: is used to reduce numbers of organism that increase.
Transferring animals to places where there are small populations is one option.
An alternative is Birth control: A vacine is used which targets the region surrounding the layer of glycoprotiens around the egg.
When the vaccine is injected in to a female animal, it stimulates an immune response that produces antibodies against these glycoprotien.
The antibodies attach to the glycoprotiens around the female's own eggs, so blocking sperm from fertilising the egg. Has 90% success rate in mamals.
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