Why do birds abundant in estuaries?

Birds are abundant in estuaries due to the rich biodiversity and abundant food sources these habitats provide. Estuaries serve as nurseries for fish and invertebrates, attracting a variety of prey that supports both resident and migratory bird populations. Additionally, the diverse vegetation and tidal zones offer ideal nesting sites and shelter, enhancing the habitat's attractiveness for various bird species. This combination of resources makes estuaries crucial for bird conservation and biodiversity.