How do upside down sand dollars right themselves?
They dig one side into ground and stick the other end out. Eventually, the waves and currents flip them over. This is laborious and they usually need to be in water to achieve this. So please put sand dollars back the right way around. Dollar babies: Sand dollars have separate genders and are usually either male or female. They practice external fertilisation, releasing eggs and sperm simultaneously into the water. Sand dollars undergo metamorphosis and their larvae look nothing like their adults. The form that first hatches from the eggs are bilaterally symmetrical and free-swimming, drifting with the plankton. At this stage, they have several long ‘arms’ which are believed to funnel food particles into the central mouth. They eventually settle down and develop into a more sand dollar-like shape. One species of sand dollars (Dendraster excentricus of the US) is known to settle in response to a substance released by adults. This might explain why so many sand dollars of the same specie
