31. Plenty enough to hold one pair of every land animal ! 32. The largest land animal on the mainland is the elk ( : moose ). 33. The bison is the largest land animal in North America. 34. The greater the mobility of the neck, the more visibility the land animal has. 35. The whales evolved from land animals that returned to the sea millions of years ago. 36. Researchers said the iguanas'cruise showed that land animals can migrate between islands through accidental voyages. 37. It is the largest land animal on the islands where its only enemy is man. 38. First appearing in the Silurian period, millipedes are some of the oldest known land animals . 39. :Some other factors that limit the size of land animals are circulatory and nervous systems. 40. However, the sanctuary is more famous for its bird life rather than the land animals .
