| Outside Pittsburgh he'd found her flowered hat floating in a pond, half pecked apart by birds. |
| It clawed, pecked and fluttered its short, stubby wings as it thrashed about to get free. |
| Artists were stimulated by Pliny's descriptions of painted grapes so magically real that the birds pecked at them. |
| Ground or pecked stone tools include hammerstones, anvils, cobble manos, metates, and a possible net sinker. |
| In this experiment, demonstrator pigeons either stepped on a treadle or pecked at the treadle to obtain a food reward. |
| All subjects had participated in an earlier experiment in which they pecked at black and white symbols to procure food rewards. |
