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Many "monogamous" female songbirds secretly mate with neighboring males to diversify their offspring's genetics.

It is important to note that biologists distinguish between two types of exclusivity: www m animal sex com exclusive

These hormones trigger the brain’s reward center, effectively addicting the vole to its partner. If a partner dies, the surviving vole exhibits behaviors analogous to human clinical depression, refusing to find a new mate and showing elevated stress hormones. Evolutionary Utility: Why Exclusivity Wins Evolutionary Utility: Why Exclusivity Wins , the release

, the release of during mating creates a lasting chemical link between the partner's image and intense pleasure. The chemical story of vole love is identical

They defend territory and raise cygnets together every year.

When researchers blocked the vole’s oxytocin receptors, he became a rogue, forgetting his partner entirely. The chemical story of vole love is identical to the chemical story of human attachment. If you have ever felt "addicted" to a lover, you know exactly how the male prairie vole feels.