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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.
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