A marsh may also be referred to as a "wetland." The coastal marsh on which Rayader lives is brackish, combining fresh water from rivers and salt water from the North Sea. The water levels in the Essex estuaries rise and fall with the tide. This semi-aquatic habitat is the perfect environment for many aquatic plants.
The scientific name for the hunchback condition is Kyphosis: a curving of the spine that causes a bowing of the back or slouching posture. Kyphosis can occur at any age, but is rare at birth. The adolescent onset of the disease is called Adolescent Kyphosis, or Scheuerman’s disease. It is caused by the fusing together of several vertebrae. Other causes of kyphosis include osteoporosis, spondylolisthesis, endocrine diseases, disk degeneration, tumors, polio, muscular dystrophy and spina bifida.
The variety of snow goose that Frith brings to Rayander is a white-morph. They are white with black on the tips of their wings. They measure 19" in length, with a wingspan of 58-59". Their feet and legs are pink, as is their bill. Black patches along the edge of the bill give the appearance of a grin.
They breed in the Arctic and then migrate to lower parts of North America. They are very vocal and can often be heard from more than a mile away.