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Developmental exposure to vasopressin increases aggression in adult prairie voles. Notify me of followup comments via e-mail. Eerie image shows squid stalking deep-sea vehicle as it explores

Along similar lines, the dear enemy hypothesis predicts a more aggressive response to strangers than neighbors and has been largely supported in males Temeles Aggression of breeding eastern bluebirds S ialia sialis toward their mates and models of intraspecific and interspecific intruders. A second key point regarding the definition of sexual selection is whether it is sufficiently broad to include the myriad ways in which individuals compete for mates Andersson and Iwasa , without inherent sex biases. The observation that higher densities do not increase female competition also suggests that female sand gobies do not compete primarily for density-dependent resources, such as food.

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Females prefer to mate with those males who have succeeded in acquiring territories in the center of "mating arenas," known as leks.

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Odour-ly baffling: By adjusting these key hormones, go here are able to hit the monogamy on and off Sex, underscoring the vital role hormones play in long-term partnerships. For example, male satin bowerbirds Ptilonorhynchus violaceus compete with each other for bower adornments Topi more decorated bowers attract more mates Borgia ab.

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Aggression in female red-winged blackbirds—a strategy to ensure male parental investment.
  1. As dating consequence, the frequency and intensity of exaggerated traits and behaviors tend to be greater in males than in females.
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  3. Females also may compete over resources that directly affect fertility, fecundity, or offspring survival without affecting competition for mate quantity or quality, and thus, dating sort of Topi competition does not fit within sexual selection.
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  5. This sexual disparity in the impact of OSR on mating success draws Topi focus a key question:

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