Still, the fact that crows and human toddlers can both count this way — that they share this ability despite rather different brain architectures — is striking, says Liao. "It's one of the ...

and the crows had to count them by pecking. ANDREAS NIEDER: They can see three dots and then produce three pecks and then press an enter key sort of in order to tell us that they're done with the ...

In one study, for example, a computer screen showed crows a certain number of dots, and the crows had to count them by pecking. ANDREAS NIEDER: They can see three dots and then produce three pecks and ...