Rennet, the stomach contents of an unweaned animal; also, the membrane lining the stomach. The word rennet also refers to preparations that contain the enzyme rennin and that are used in curdling milk. The chief source of rennet is the fourth stomach of young calves. Rennet is used in making cheese, junket, and medicinal preparations. It is also used to coagulate casein (a milk protein) in making plastics.
The pirarucu, or arapaima, is an important food fish of South America. It is one of the largest freshwater fish in the world, thought to be exceeded in size only by the European catfish.
Blowfly is a fly with a black head and thorax and metallic blue or green abdomen. It is 1/4 to 5/8 inch (6 to 16 mm) long and has bristles on its thorax and at the base of its wings.