1 The posterior pituitary lobe releases two hormones that are produced in the hypothalamus:  Oxytocin, which is responsible for stimulation of milk ejection (milk letdown) and for stimulation of uterine smooth muscle contraction at birth.
Crayfish and crawfish are crustaceans living in freshwater with a great resemblance of the lobsters. However, their size is smaller compared to the lobsters.
Crayfish. Crayfish.also known as crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they are not closely related. They breathe through feather-like gills and live on the muddy bottom of freshwater lakes, rivers, dams and streams.rayfish.also known as crawfish, or crawdads are freshwater crustaceans resembling small lobsters, to which they are not closely related. They breathe through feather-like gills and live on the muddy bottom of freshwater lakes, rivers, dams and streams.