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Kiwi's Giant Egg: A Mystery Solved?

2025-05-03

The flightless kiwi bird lays an egg that can weigh up to a quarter of its body mass, a phenomenon long attributed to a legacy from larger ancestors. However, new DNA analysis challenges this theory, suggesting the kiwi's giant egg is an adaptation developed as it evolved from a smaller flying bird. The oversized egg allows kiwi chicks to be more precocial, increasing their survival rate in an environment with few ground predators but numerous aerial ones. This research reshapes our understanding of kiwi evolution and avian evolutionary processes.

Crows and Magpies Use Anti-Bird Spikes in Nest Building: A Rebellious Act of Nature

2025-03-14

Common anti-bird spikes, designed to deter birds from buildings, are being ingeniously repurposed by crows and magpies as nesting material. A new study reveals these birds collect and integrate the spikes into their nests, even potentially using them as defense against other birds. Researchers found this behavior in several European cities, with one magpie nest containing approximately 1,500 visible spikes. This discovery not only highlights the remarkable adaptability and intelligence of birds but also prompts reflection on the balance between urban development and wildlife.