Before revision: There is a 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: commonThere is a 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.