The cover is featuring the article 'What do we really know about the water repellency of feathers?' by Frank Muzio and Margaret Rubega. The two authors review almost 100 years of literature on how the structure of feathers affects their ability to repel water. They discuss how chemical and structural properties affect how feathers interact with water and the complexities involved in understanding what makes feathers repel water. A comprehensive synthesis about the current state of knowledge on the water repellency of feathers. Photo by Frank Muzio. 

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