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 reproduce sexually and are capable of regeneration. Crayfish are either male or female, the males being the larger of the two. Usually mating occurs in autumn or spring, however the females can store the sperm from a fall mating until the spring when the eggs are fertilized and laid.