The pigeon post faced a heavy mortality among the pigeons as many were lost on the operations.

Replies: First, without careful data collection there is no reason to assume that an unusually hard winter means there has been "extremely heavy mortality" of insects.

Another explanation for the skewing of sexual ratio might be that there is heavier mortality among females, particularly lactating ones, during times of drought.

This was to cover the Priory's property and debts following "unusually heavy mortality amongst their cattle" and "the badness of the past few years".

It is infectious and causes heavy mortality in the eastern oyster; survivors, however, develop resistance and can help propagate resistant populations.

Numbers can be adversely affected by severe winters, which may cause heavy mortality, and cold wet summers, which reduce breeding success.

One source blames the abbey's poverty on failed harvests and heavy mortality of their cattle.

Many of the species are plant diseases of major economic importance, causing significant damage and (in some cases) heavy mortality in conifers.

Most captured sharks are discarded, probably with heavy mortality.

The desperate shortage of food and the breakdown of medical services resulted in heavy mortality, Catholicos Patriarch Leonid being among the dead.