This Big Sandy crayfish had an eggciting surprise in store for biologists at White Sulphur Springs National Fish Hatchery -- a new clutch of healthy eggs! The Big Sandy crayfish typically mate in late summer or fall, and they reproduce in a unique way. Males place a packet of sperm within a pocket on the female, where she stores it over the winter. In the spring, she will spin a reproductive tent where the eggs are rolled over the sperm packet and externally fertilized. In this photo, we can see the fertilized eggs stored on her abdomen, which will hatch in about a month! 📸 Alexandria Dodd/USFWS