cracked: Dolphins, crows, primates and parrots have all been observed using unique calls when they want the attention of specific members of their groups. This means that, at least among these species, individual animals actually have the equivalent of

cracked: Dolphins, crows, primates and parrots have all been observed using unique calls when they want the attention of specific members of their groups. This means that, at least among these species, individual animals actually have the equivalent of

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