#thepresidio

Mr. Science showing off the eggs of a pregnant Purple Shore Crab #mother! Female crabs have a wide pleon (sort of like a tucked-under tail) to hold her eggs. A male will have a narrow one, which makes it very easy to tell the difference, even for kids! #stemeducation #scienceeducation #nochildleftinside #motherhood #crabs #ggnra #crissyfield #sanfrancisco #thepresidio #stem