Thyroid-Stimulating Hormone (TSH). Guide. A thyroid-stimulating hormone (TSH) blood test is used to check for thyroid gland problems. TSH is produced when the hypothalamus releases a substance called thyrotropin-releasing hormone (TRH). TRH then triggers the pituitary gland to release TSH.
A Raven is black but depending on which way the light hits it they change to other colors like bluish, dark red, or greenish. There are white Ravens but are not albino.
Corvids are generally somber colored birds; the adult crows and ravens are all black while shades of gray, blue, brown, and black are the norm for other species. The exception is the Green Jay; a beautiful green and yellow bird with blue and black markings on the face.