Before revision: This has contributed to a common perception amongst researchers that mammals and birds share similar "advanced" cognitive characteristics as humans, while other vertebrates such as teleost fishes are more "primitive", which has lead to them being understudied.
After revision: This has contributed to a common perception amongst researchers that mammals and birds share similar "advanced" cognitive characteristics as humans, while other vertebrates such as teleost fishes are more "primitive", which has led to them being understudied.