Replication of the mirror mark test experiment in the magpie (Pica pica) does not provide evidence of self-recognition.

@article{Soler2020ReplicationOT,
  title={Replication of the mirror mark test experiment in the magpie (Pica pica) does not provide evidence of self-recognition.},
  author={Manuel Soler and Jose M. Colmenero and Tom{\'a}s P{\'e}rez-Contreras and Juan Manuel Peralta‐S{\'a}nchez},
  journal={Journal of comparative psychology},
  year={2020}
}
Self-recognition in animals is demonstrated when individuals pass the mark test. Formerly, it was thought that self-recognition was restricted to humans, great apes, and certain mammals with large brains and highly evolved social cognition. However, 1 study showed that 2 out of 5 magpies (Pica pica) passed the mark test, suggesting that magpies have a similar level of cognitive abilities to great apes. The scientific advancement depends on confidence in published science, and this confidence… 

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