Ducks and most other large birds have a bump at the base of their tail feathers called a uropygial gland, or oil gland, that secretes oil that birds use to spread on their bodies.
Take it to a vet.
A lump on the back of your head that is itchy may be from an inset bite. If the lump does not go away, visit a doctor.
A lump the size of a golf ball should be checked by a doctor. This may go away on its own, but if it does not, it should be evaluated for possible needed treatment.
Make sure the dog doesn't lick it and get the dog to the vet ASAP.
Cockatiels should not have a lump on their throat.
the lump helps you create a bad bad thing in your own throat. You should have a lump in your throat once in a while when your start to have your you know what and it is very important.
For a lump on the back of your head you could see a dermatologist (skin doctor) or oncologist (cancer specialist), or possibly an endocrinologist (if the lump has a hormonal cause). For a lump in the back of your head, you could see a neurologist.A general practitioner / family doctor will be able to give you a "top to toe" check up and see if there's anything you need to be referred for.
The Hampster needs expert medical treatment so you should take it to a vet.
Get it checked over by a doctor.
go see a doctor
ducks can!
There can be many medical conditions that may cause a lump on the back of the head near the skull, including a cyst, a swollen lymph node in this area, and a tumor. Tumors in this area of the head can be either a benign lipoma or a cancerous growth. If the lump causes pain and is increasing in size, it should be checked by a doctor.