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.
See, crayfish are dimorphic which means that yes you could differentiate a male from a female. But to do so, you need to look them from a ventral view, which may require some handling. Males have the first pair of swimmerets modified as a copulatory organ.