Phonological perception by birds: budgerigars can perceive lexical stress.

We found that all humans participants that learned the task generalized (all z s ≥ 2.45, all P s ≤ 0.014) and two (both zs ≥ 4.00, both Ps < 0.001) of the three budgerigars generalized and the third approached significance ( z = 1.89, P = 0.059).

also in 8,237 other papers