Canyon wrens alter their songs in response to territorial challenges
Many animals use low frequency and harsh sounds in aggressive contexts. Low frequencies are correlated with body size in some species, and thus can provide an indication of fighting ability. Because of this, low frequencies and harsh sounds may also indicate aggressive intent and motivation to attack. We tested for facultative adjustment of vocal behaviour […]
Territorial aggression reduces vigilance but increases aggression towards predators in a cooperatively breeding fish
In many species, aggressive individuals outcompete their less aggressive conspecifics for resources such as food and access to mates. Nevertheless, variation in aggression is maintained in populations, but the underlying mechanisms are not well understood. Here we tested the hypothesis that aggressive behaviours compromise the antipredator behaviour of prey, which would link aggressive behaviours to […]