| Choosing extensively forested landscapes should lead to reduced levels of nest predation and brood parasitism for songbirds. |
| The probability of parasitism may vary among hosts because differences in their behaviors assist cowbirds in locating nests. |
| These were sites where no spring parasitism by C. florus had been observed. |
| The stock market boom was based to a considerable extent on speculative capital, parasitism, and outright swindling. |
| In addition, natural densities of hoppers and levels of parasitism differed among sites. |
| Scientists observed virtually no springtime parasitism by wasps of the apple-feeding leaf rollers. |
