Certain fungi parasitise the roots of oak trees, slowly weakening the host until it can no longer absorb enough water.

The abandoned nest had been parasitised by cuckoos, leaving the remaining chicks weak.

The parasitised caterpillar hung motionless from the leaf, its body slowly consumed by the developing wasp larvae.

The mistletoe parasitises the branches of the eucalyptus tree, drawing nutrients and water from its host.

The ecologist documented several parasitisations among the island's bird species.

The parasitisation of native bee populations by invasive wasps has raised urgent conservation concerns.

The mistletoe was parasitising the oak's upper branches, steadily drawing away its water and nutrients.