When pied and collared flycatchers interspecies breed
Problem: When pied and collared flycatchers interspecies breed, the hybrids have lower fitness (are less likely to survive and reproduce) than either parent. What reproductive isolating barrier might this be?
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When pied and collared flycatchers interspecies breed, the hybrids have lower fitness (are less likely to survive and reproduce) than either parent.
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