A dear enemy relationship in a territorial cichlid: evidence for the threat-level hypothesis

Facial Recognition in a Group-Living Cichlid Fish

(2015) Masanori Kohda et al.   PLoS One

The evolution of cooperative breeding in the African cichlid fish, Neolamprologus pulcher

(2010) Marian Wong et al.   BIOLOGICAL REVIEWS

Good neighbour, bad neighbour: song sparrows retaliate against aggressive rivals

(2009) Çağlar Akçay et al.   ANIMAL BEHAVIOUR

Liver size reveals social status in the African cichlidNeolamprologus pulcher

(2009) N.M. Sopinka et al.   JOURNAL OF FISH BIOLOGY

Beyond ‘nasty neighbours’ and ‘dear enemies’? Individual recognition by scent marks in a lizard (Podarcis hispanica)

(2008) P. Carazo et al.   ANIMAL BEHAVIOUR

When to be a dear enemy: flexible acoustic relationships of neighbouring skylarks, Alauda arvensis

(2008) Elodie Briefer et al.   ANIMAL BEHAVIOUR