Question

In Hyderabad, the increase in pigeon population led to a decrease in crow population. What phenomena does this explain?

• A. Invasion of alien species
• B. Deforestation
• C. Migration of birds
• D. Biodiversity conservation

Answer 1

The correct option is A Invasion of alien species

When an alien species (non-native species) is introduced into a new ecosystem, it spreads throughout the natural habitat and threatens the biodiversity. In Hyderabad, when the pigeons were introduced, their population gradually increased. This posted a threat to the native species like crows and eventually decreased the crow population due to exploitation of resources. This phenomenon is called the invasion of alien species.