Tetralogy of Fallot is a birth defect that affects normal blood flow through the heart. It happens when a babyâs heart does not form correctly as the baby grows and develops in the motherâs womb during pregnancy. It is a congenital defect, meaning the baby is born with it.Tetralogy of Fallot is made up of the following four defects of the heart and its blood vessels: 1  A hole in the wall between the two lower chambersâor ventricles âof the heart. 2  This condition also is called a ventricular septal defect.t is a congenital defect, meaning the baby is born with it. Tetralogy of Fallot is made up of the following four defects of the heart and its blood vessels: 1  A hole in the wall between the two lower chambersâor ventricles âof the heart. 2  This condition also is called a ventricular septal defect.
A drey â or dray â is a nest of a tree squirrel or a flying squirrel. Dreys are usually built of twigs, dry leaves, and grass, and typically assembled in the forks of a tall tree.They are sometimes referred to as âdrey nestsâ to distinguish them from squirrel âcavity nestsâ (also termed âdensâ).quirrels may also nest in attics or exterior walls of buildings, where a drey may be regarded as a fire hazard, as some squirrels have a habit of gnawing on electrical cables. At other times, squirrels may inhabit a permanent tree den in the hollow of a trunk or large branch.
Report Abuse. A squirrel's nest is called a Drey,they're usually made in trees, but sometimes the little blighters build them in your loft then they're called a Nightmare !!Source(s): my dad told me when i was a kid, whilst walking in the woods.Ed Â· 7 years ago.Thumbs up. squirrel's nest is called a Drey,they're usually made in trees, but sometimes the little blighters build them in your loft then they're called a Nightmare !! Source(s): my dad told me when i was a kid, whilst walking in the woods. Ed Â· 7 years ago. Thumbs up.