Animal Adaptations The Big Question
This past Sunday… • I went to an animal hospital because my bunny was sick.
Alfred Russel Wallace -British explorer and scientist
His Question (1858) • Question: How do animals change??? • Answer: On the whole, the best fitted live and pass down their genes.
Survival of the Fittest • Survive: • To go on living, to not die
Survival of the Fittest • Fit:
Survival of the Fittest • Fit: • In good health, in good shape
Survival of the Fittest • The best fitted will live. • The healthiest animals survive from disease. • The fastest animals survive from being eaten.
OK… So, how do animals change? • Long, long time ago, giraffes had shorter necks. • There was too much competition for food. • Some giraffes had a bit longer necks. • They could find food better!
Animals Change Over Time • Long, long ago…
Animals Change Over Time • Long ago…
Animals Change Over Time • A bit long ago…
Animals Change Over Time • Nowadays…
Variations • Variations: differences in animals • Example: Some giraffes had little bit shorter necks, and some giraffes had little bit longer necks.
Passing Down Traits • Animals pass down their traits to their offspring. • Pass down • Traits • Offspring Child (offspring) Child (offspring) parent parent
Natural Selection • Nature: the world of living things and outdoors • Select: to choose • So… What is natural selection? • Similar to the idea of “survival of the fittest” • Nature chooses who will survive and who will die
You’ve Got Mail! • Wallace sent his ideas to Charles Darwin • Charles Darwin: a respected scientist in England
Charles Darwin • He was shocked to see Wallace’s finding! • It was too similar to what he has been working on! • Charles Darwin: the father of evolution • Evolution: • a theory which states that animals evolve (change) over time
His Work on Galapagos Islands • Galapagos Islands
Galapagos Finches • Finch: a type of bird • Darwin saw many variations. • He came up with the theory of natural selection by studying these finches.
Clever Compromise • Wallace’s and Darwin’s works were published together.