Drs. Robert Epstein & BF Skinner with Pigeons-Part 1
drrobertepstein
between her peck at the the hidden color
""peck at"" — escúchalo en videos reales de YouTube
Se encontraron 6 ejemplos de ""peck at"" en 4 videos de YouTube con subtítulos. Haz clic en cualquier resultado para escuchar a hablantes nativos — gratis, sin registro.
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the crow continues to like just peck at its at its back.
EXTREME modern makeover for a small apartment | living room + home office
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.