1. Cane toads (Rhinella marina) in Australia: Cane toads were introduced to Australia in the 1930s to control the cane beetle population in sugarcane fields. However, they quickly spread across the country, becoming highly invasive. They have toxic skin secretions that native predators are not adapted to, leading to declines in native species that prey on them. Additionally, their voracious appetite and ability to reproduce rapidly have resulted in competition for food and resources with native species.

2. European starlings (Sturnus vulgaris) in North America: European starlings were introduced to North America in the late 19th century by a group that wanted to introduce all the birds mentioned in Shakespeare's plays. Since then, they have become one of the most widespread and abundant bird species in the continent. Starlings compete with native birds for nesting sites and food, often displacing them from their natural habitats. They also have a negative impact on agricultural crops and may contribute to the decline of certain native bird species.

3. Nile perch (Lates niloticus) in Lake Victoria: The introduction of Nile perch to Lake Victoria in the 1950s has had devastating effects on the lake's ecosystem. While the intention was to boost fisheries and provide economic benefits, the Nile perch became a top predator in the lake, feeding on and drastically reducing the populations of native fish species. This has led to the extinction of several endemic fish species and disrupted the entire food web of the lake. The loss of native fish species has had socio-economic consequences for local communities that rely on fish for both subsistence and trade.

These examples illustrate how the introduction of invasive alien species can have significant negative impacts on native biodiversity, often leading to the decline or extinction of indigenous species.