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 reside on every continent other than Africa and also Antarctica. There are 200 types of crayfish in The United States and Canada. Crayfish are likewise called craw-fish, crawdads and also mud bugs.