crossbreed

And when distant relatives "crossbreed," this can lead to the emergence of viruses with completely new properties.

Precise details aside, the same Old World parentage that wards off native insects, plus the crossbreed’s own renowned hardiness, helped planetrees resist the diseases that all but wiped out the American elm and American chestnut, two previously popular street trees.

One tiny, black-haired crossbreed chihuahua has a pair of silver wings on its back, drawing coos of appreciation.

In October, the government banned the crossbreed under the Dangerous Dogs Act 1991 following a rise in fatal attacks.

The canine’s owner, Jessica Klugman, decked the 11-year-old chiweenie — a crossbreed of a chihuahua and a dachshund — in a blonde wig and pink glittery bodysuit for a dog costume contest as part of Saturday’s Halloween in Hopkins, Minnesota.