* Feral Cats: Domestic cats, when left to roam freely outdoors, can become feral and prey on native wildlife, disrupting ecosystems. They are considered one of the most significant threats to birds and small mammals.
* Feral Pigs: Domestic pigs, escaped or intentionally released, can reproduce rapidly and cause widespread damage to crops, forests, and native ecosystems. They also compete with native animals for food and resources.
* Feral Goats: Introduced for meat or milk production, feral goats can overgraze vegetation, leading to soil erosion and habitat loss. They are particularly problematic in mountainous and arid regions.
* Feral Horses: Domesticated horses, often released or escaped from farms, can graze extensively and damage sensitive ecosystems. They can also compete with native grazers and alter plant communities.
* Feral Dogs: Similar to cats, feral dogs can prey on native animals and spread diseases. They can also pose a threat to livestock and humans.
It's important to note that the term "invasive" applies to any species, whether domesticated or wild, that establishes a population in a new environment and causes harm to native ecosystems.