PMC7569178_01
The star shows the birds head and neck which is where the distal oesophagus tappers off. The triangle is in the area of the body and tail of the bird which is representative of the dilated portion of the oesophagus with food debris. The circle shows one rib of the thoracic cage encircling the bird.
gr3.jpg
PMC7569178_01_gr3.jpg
fig0015