Figure 1: Kindness to kin reduces harm to females. | Nature

Figure 1: Kindness to kin reduces harm to females.

From: Brotherly love benefits females

Figure 1

a, Unrelated male fruit flies compete with each other and court females aggressively. Carazo et al.3 find that this behaviour harms females by causing them to age rapidly (in reproductive terms) and ultimately to produce fewer offspring. b, By contrast, the authors observe that brothers compete and court less aggressively; consequently, the females are reproductively successful for longer and produce more offspring. This reduced aggression between brothers also benefits the males: by helping his brothers to reproduce, a male indirectly propagates copies of some of his own genes.

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