Big Brains, Long Wingspans, Large Size, and Wide Beak Variation Helped Crows and Ravens Expand Across the World

Crows and ravens are well known for their black color and the harsh “caw” and “gurgling croak” they make, respectively. They are intelligent birds that use tools, solve complex abstract problems, and speak a volume of words. But what is less well appreciated is how diverse they are. Their diversity is accompanied by their ability to live all over the world in a variety of habitats. In fact, they are one of the most widespread groups of birds worldwide. Crows and ravens--part of the avian family of Corvids that also includes jays and magpies--underwent rapid global expansion, unlike other family members that stayed mostly within single continents. What is their secret to this amazing planetary expansion?
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