Invertebrate Animals: The animal kingdom is full of diverse species, each uniquely adapted to survive in its environment. Among them is a vast group known as invertebrates, animals that do not have a ...

Originally published 1938, 2nd edition published 1948. https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!1081471 ...

A new study suggests 60-foot-long creatures resembling the mythical “kraken” were top marine predators millions of years ago.