Male turkeys have a snood, a flap of skin that hangs across their beak. Snood length is negatively correlated with parasite load e.g., males with longer snoods have fewer parasites), and females prefer to mate with long- snooded males. This is an example of

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This is an example of sexual selection via female choice. Females prefer to mate with males with longer snoods, and this preference may have evolved because longer snoods are a signal of lower parasite load and therefore better genetic quality in males.

Male Turkeys Have a Snood, a Flap of Skin That