There is a verse in the Padma Purana which says that a pet parrot can learn to chant Hare Krishna ...
Where is that verse located in the Padma Purana?
It is found in the Uttara Khanda of the Padma Purana:
The wife said: O Lord, O ocean of virtues, listen to my words. If for some reason you are angry with your mother, speak out to me. O good one, formerly you never resorted to silence like this. Some younger brother has insulted you. This parrot in the cage does not eat food without you. Give him well-cooked food, so also to the sarika uttering indistinct but sweet words. Teach the parrot and the sarika the series of names of Vishnu (like) 'Rama, Rama; Hare Krsna'. Get up. The two are very clever. What offence have I done to you, that you are not talking to me? I have well preserved the wealth which you have given to me. O Lord, I will not wait till the delivery of your lustre (i.e. semen) that you have put into me. I shall follow you. (Padma Purana, Uttara Khanda, Chapter 209, Verses 36b-41)