Outline 15-1: The Voyage of the Beagle 2/24/2019

I. Charles Darwin A. Darwin’s Great Adventure 1. Went on 5 year voyage on the HMS Beagle (1831) a. Collected specimens b. Made many observations c. Read latest books 2/24/2019

2/24/2019 Darwin’s Voyage

2. Darwin visited the Galapagos Islands a. Noted similarities between plants and animals of the islands and the mainland of Ecuador 1000 km away. b. Hypothesized that:  ancestors of Galapagos species migrated there from South America and  changed after they arrived Ex: Galapagos finches & tortoises 2/24/2019

2/24/2019 Location of Galapagos Islands mm

2/24/2019 Galapagos Islands mm

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mm Galapagos Tortoises Short neck: abundant food near ground 2/24/2019 Short neck: abundant food near ground Long neck helps to reach food mm

Examples of Grassland animals: Elephants & giraffes in Africa c. Darwin noted that animals & plants seemed remarkably well suited to their environments.  He was puzzled by the different animals that inhabited similar environments in different parts of the world Examples of Grassland animals: Elephants & giraffes in Africa Bison in North America Kangaroos in Australia 2/24/2019

Grassland Animals of World 2/24/2019 mm

d. Darwin also collected fossils.  Some fossils resembled organisms that were still alive. Ex: Extinct Glyptodon resembles living armadillos  Others looked completely unlike any creature he had ever seen Ex: dinosaur fossils 2/24/2019

Size of a large football Extinct Glyptodon 2/24/2019 Size of a VW Beetle car Armadillo mm Size of a large football