48S 



LAND ANIMALS 



more humid regions, the guano is leached into the underlying limestone 

 to form a valuable lime-phosphate fertilizer. 29 



Man. — Maritime communities of our own species are an integral 

 part of the vertebrate life of seacoasts. Like those of other land mam- 

 mals, his are limited to inshore waters of iceless regions unless sup- 

 plemented by boats. Aided by small boats many such communities gain 

 their livelihood by preying upon sea life, returning nightly to the shore. 



Fig. 12S. — Rookery of 



fur seal, CallorMnus ursinus, on the Prvbiloff Islands. 

 Photo by W. H. Osgood. 



With larger vessels the independence of the shore becomes greater, 

 but even under these conditions, seafaring men normally rest and rear 

 their families ashore and hence resemble, in their ecological charac- 

 teristic, the sea turtles, seals, and sea birds which also obtain their 

 food from the sea and rear their young along its coasts. 



BIBLIOGRAPHY 



1) Sarasin & Sarasin, 1905, Reisen in Celebes, 2, p. 48.-2) Schubotz, 1912, 

 Ber. Senckenberg Ges., p. 336 ff.— 3) Voeltzkow, 1890, Ausland, p. 544.— 

 4) Hempelmann & Strassen, 1911, Brehms Tierleben, 4 ed., 7, p. 249.-5) Chap- 

 man, 1912, Handbook Birds of Eastern North America.— 6) Brehm, Tierleben, 

 1 ed., Vogel 2, p. 554 ff.— 7) Berg, 1930, To Africa with the Migratory Birds.— 

 8) Miller, 1918, In the Wilds of South America, p. 221.— 9) Roosevelt, 1926, 

 Through the Brazilian Wilderness.— 10) Arthur, 1928, Bull. La. Dept. Conserva- 

 tion, 18.— 11) Hagmann, 1917, Zool. Jb. Syst., 26, p. 17.— 12) Jordan, 1898, 



