“Through trial and error, the birds learned that each cue corresponded to a set number of caws between one and four,” Live Science wrote. “After …
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.
Read More at Source.