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sand burrowing mollusc
When the tide comes in or goes out, the water replaces the sand there, making the animal's presence practially unknown.
yes they burrow holes in the sand in the desert
Yes they are. They are flattened burrowing sea urchins.
Bananas
The most common predators of sand dolars are ocean pouts and sunflower starfish. Sand dollars do not have many predators.
The sand rat (Psammomys obesus) like most animals that live in a desert environment do have predators such as raptors.
Because that is where they live, that way they can burrie themselves in the sand to get protection from predators.
preys
it depends which one you like better. Sand is good for burrowing under, but coconut husk isn't as messy i think
None, the sand fish owns all! :Dand yes I know what they are
sand flea