POTD 3/4/23
BIG BEAK - A large beak like a grosbeak's is designed for cracking large and hard seeds. The real key to being able to crack hard seeds is stronger jaw muscles. Larger and stronger muscles require a wider, stronger jaw and also require a larger, reinforced bill to withstand the extra bite force generated by the larger muscles. This female Evening Grosbeak cracks sunflower seeds at the feeder.
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© Paul Willis Photographs