Means–end comprehension in four parrot species: explained by social complexity

Big brains are not enough: performance of three parrot species in the trap-tube paradigm

(2010) Jannis Liedtke et al.   ANIMAL COGNITION

String-pulling in spectacled parrotlets (Forpus conspicillatus)

(2010) Anastasia Krasheninnikova et al.   BEHAVIOUR

An Investigation into the Cognition Behind Spontaneous String Pulling in New Caledonian Crows

(2010) Alex H. Taylor et al.   PLoS One

Means to an end: Neotropical parrots manage to pull strings to meet their goals

(2008) Cynthia Schuck-Paim et al.   ANIMAL COGNITION

Brains, Lifestyles and Cognition: Are There General Trends?

(2008) Louis Lefebvre et al.   BRAIN BEHAVIOR AND EVOLUTION

A Multilocus Molecular Phylogeny of the Parrots (Psittaciformes): Support for a Gondwanan Origin during the Cretaceous

(2008) Timothy F. Wright et al.   MOLECULAR BIOLOGY AND EVOLUTION