How Many Grizzly Bear Cubs 1 of 2

Four grizzly cubsYes there are four first year cubs and this is one of two sets we have seen in our viewing area this year. Twins and triplets are common but four is still rare. After mating, the female may be pregnant, but that does not mean she will give birth to cubs. Bears have developed a process called delayed implantation. The fertilized egg develops into a small embryo called a blastocyst. This is where the interesting stuff begins. After this brief period of development, of the fertilized egg suddenly stops growing and simply floats freely in the uterus for several months. If a sow is in peak condition when she heads into her winter den, the embryo implants in the uterus and begin to develop. She’ll wake up during January or February to give birth. Healthy bears tend to have multiple births so this indicated we have a very healthy population of grizzlies.