Most birds produce substantial upward force ... a millimeter-length muscle movement is enough to drive their wings across a wide arc. Hummingbirds often brave downpours to gather the nectar ...
Australian birds are changing shape due to rising temperatures. Over 100 species show smaller bodies and larger beaks, aiding heat dissipation. Long-term warming increases beak size, but short ...
Their monitoring includes measurements such as bill length, wing length and body mass in more than 100,000 individual birds. The data allowed us to identify increasing beak sizes and decreasing body ...