Drs. Robert Epstein & BF Skinner with Pigeons-Part 1
drrobertepstein
between her peck at the the hidden color
""peck at"" — écoutez-le dans de vraies vidéos YouTube
6 exemples de ""peck at"" trouvés dans 4 vidéos YouTube sous-titrées. Cliquez sur un résultat pour entendre des locuteurs natifs — gratuit, sans inscription.
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the crow continues to like just peck at its at its back.
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TheSorryGirls
I am going to peck at this grass with my free range abilities.
Drs. Robert Epstein & BF Skinner with Pigeons-Part 1
drrobertepstein
harder still by introducing a delay between her peck at the the hidden color
Drs. Robert Epstein & BF Skinner with Pigeons-Part 1
drrobertepstein
between her peck at the the hidden color and the availability of the color keys
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And it flies up while the crow continues to like just peck at its at its back.