There are several different kind of tumors that ferrets can get - Insulinomas, Lymphosarcoma, Adrenal Gland Cancer, Skin tumors
Depending on the type of cell that becomes cancerous, some of the common ones are fibromas and fibrosarcomas (tumors of the connective tissue), adenomas and adenocarcinomas (tumors of skin glands), mast cell tumors, hemangiomas (tumors of blood vessels) and basal cell tumors.
Because they do not know what kind of animal ferrets are.
There are probably millions of Domestic ferrets, European polecat ferrets. Black footed ferrets - As of 2007, the total population numbers well over 600 in the United States.
Neurosurgeon.
A ferret that consumes sugar or carbohydrates on a regular basis will eventually turn into Insulinomas - tumors of the insulin-producing cells in the pancreas. Ferrets that consume chocolate could possibly cause death.
Ferrets will only eat what is necessary - they are carnivores (meaning meat eaters)
Domestic ferrets do not kill chickens. Any kind of weasels in the wild would prey on chickens. Keep them in a pen.
least weasels, short-haired weasels, & ferrets
benign
Every reference I saw it was that they were a kind of plague or punishment.
Black footed ferrets eat prairie dogs. Domestic ferrets might eat rodents, such as rabbits, mice, rats, etc.
Ferrets are only bred with other ferrets
The collective term for a group of ferrets is a "a business of ferrets" or "a cast of ferrets".