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embryos are sustained by a placental ...
, by extension, sources of food. The silky
The sand tiger shark has a stout body with ...
The pelagic thresher (Alopias pelagicus) is a species of thresher
The egg case of an Australian Swell Shark ...
The pelagic thresher (Alopias pelagicus) is a species of thresher
. The embryo feeds on the yolk sac (a food ...
Very large rectangle shaped strong leathery egg case,beige to brown or black ...
The stingrays are a group of rays, which are cartilaginous fishes related to ...