Whales and dolphins are mammals, not fish. Scientists thing they are as smart as humans -Humpback whales communicate by singing songs -A dolphin sleeps with only half its brain at a time -The beluga is the only whale that can swim backwards -The largest animal on earth, the blue whale, can't swallow anything larger than a beach ball -A sperm whale can hold its breath for more than two hours. This description may be from another edition of this product.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.