How To Study Living Animals


THE LIVING CATERPILLAR
Materials.

Living caterpillars in cages or covered jars for individual study, and other specimens in cages with foliage for food or concealment herunterladen.

Observations.

The pupil should observe the general form and external construction of the caterpillar, watching it feeding, in action, and at rest herunterladen.

Notice how the creature moves. Find its head, its segments (similar divisions of the body), and its breathing holes along the sides of the body microsoft office kostenlos downloaden vollversion deutsch chip. Try to find its eyes, any feelers, wings or paddles. Try to loosen it from its support; find the tiny hooks on the feet for clinging fast.

Questions.

1. Give the general color of your specimen and explain how this color may make it conspicuous or may aid its concealment.

2. Describe the outer surface or covering of the caterpillar. What structures, if any, are there, which might make the animal distasteful or inedible?

3. How many pairs of legs are there? How are they distributed along the body? Counting the segments, state which ones bear no legs.

4. To what extent do the legs act in locomotion? Are they mere organs for attachment while the body swings forward and backward, or do the legs do this, as in a horse? Make a complete statement.

5. Notice the openings of the internal breathing tubes. How are they protected against dust and other foreign matter?

6. Does the caterpillar seem to be a warm-blooded animal? State how the free access of air along the body would influence internal temperature.

7. What do you know about a caterpillar’s appetite? How might caterpillars be beneficial or harmful? What means has nature of holding their numbers in check?

8. Recalling that caterpillars finally “sleep” for several days or weeks and awaken as winged creatures, how can you account for their appetites?