Middle school students can learn the ecology of each continent in depth with this series of books: Africa, Antarctica, Asia, Australia, Europe, North America, and South America.
Africa . . . . . . . . . . . . . . . . . ISBN 0-7613-1367-2
Antarctica. . . . . . . . . . . . . . ISBN 0-7613-3227-8
Asia. . . . . . . . . . . . . . . . . . . ISBN 0-7613-1368-0
Australia. . . . . . . . . . . . . . . ISBN 0-7613-3007-0
Europe . . . . . . . . . . . . . . . . ISBN 0-7613-3008-9
North America . . . . . . . . . . ISBN 0-7613-3226-X
South America . . . . . . . . . . ISBN 0-7613-1366-4