Non-breeding birds will roost on their host animals at night.

In a host animal these days, we would be happy to find one or two alive.

"To provide the next generation of host animals,"he said, switching from contempt to bitterness.

Any herds carrying local diseases could have devastating effects on host animals.

However, the genetic change has no known ill-effects on the host animal.

Some strains develop traits that can be harmful to a host animal.

"And no jungle for a host animal to live in."

"I don't want to be a host animal," I said.

They do not kill the host animal, thus are true parasites.

"We use almost no host animals these days," she said.