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.
Other Crayfish in Manitoba. There are two other species of crayfish in Manitoba: the Calico Crayfish (Orconectes immunis), also called the Papershell Crayfish, and the Rusty Crayfish (Orconectes rusticus). The Calico Crayfish is native to southern Manitoba, though its range is poorly documented.