Bibliography (29):

1. Why Some Animals Can Tell More From Less: Researchers find that densely packed neurons play an outsize role in quantitative skill—calling into question old assumptions about evolution

2. Allometric rules for mammalian cortical layer 5 neuron biophysics

3. Behavioral and Neuronal Representation of Numerosity Zero in the Crow

4. Trajectories and Constraints in Brain Evolution in Primates and Cetaceans

5. Birds do have a brain cortex—and think: Like mammals, birds have a pallium that sustains correlates of consciousness

6. The remarkable, yet not extraordinary, human brain as a scaled-up primate brain and its associated cost

7. On the Working Memory of Humans and Great Apes: Strikingly Similar or Remarkably Different?

8. The human brain in numbers: a linearly scaled-up primate brain

9. Absolute brain size predicts dog breed differences in executive function

10. Brainiacs, not birdbrains: Crows possess higher intelligence long thought a primarily human attribute

11. Wikipedia Bibliography:

    1. https://en.wikipedia.org/wiki/Number_sense  :

       https://en.wikipedia.org/wiki/Number_sense

    2. https://en.wikipedia.org/wiki/Phylogenetics  :

       https://en.wikipedia.org/wiki/Phylogenetics

    3. https://en.wikipedia.org/wiki/Number_sense_in_animals  :

       https://en.wikipedia.org/wiki/Number_sense_in_animals

    4. Bayesian statistics

    5. https://en.wikipedia.org/wiki/Random_effects_model  :

       https://en.wikipedia.org/wiki/Random_effects_model

    6. Weber–Fechner law

    7. Variance

    8. https://en.wikipedia.org/wiki/Taxon  :

       https://en.wikipedia.org/wiki/Taxon

    9. Cerebral cortex

    10. https://en.wikipedia.org/wiki/Intelligence  :

        https://en.wikipedia.org/wiki/Intelligence

    11. https://en.wikipedia.org/wiki/Baboon  :

        https://en.wikipedia.org/wiki/Baboon

    12. https://en.wikipedia.org/wiki/Cataglyphis  :

        https://en.wikipedia.org/wiki/Cataglyphis

    13. https://en.wikipedia.org/wiki/Fiddler_crab  :

        https://en.wikipedia.org/wiki/Fiddler_crab

    14. https://en.wikipedia.org/wiki/Hyena  :

        https://en.wikipedia.org/wiki/Hyena

    15. https://en.wikipedia.org/wiki/Lion  :

        https://en.wikipedia.org/wiki/Lion

    16. Cerebellum

    17. https://en.wikipedia.org/wiki/Proxy_(statistics)  :

        https://en.wikipedia.org/wiki/Proxy_(statistics)

    18. Hippocampus

    19. Natural selection