pheromones Chemicals secreted by animals, especially insects, that influence the behavior
or development of others within the same species.
spiracles Openings on the sides of the insect abdomen, through which air is taken in.
Points to Consider
- Some of the adaptations that insects have evolved for a terrestrial existence are also
displayed in amphibians and reptiles. What could be some of these? How are they
similar and different? - Insects have some very specialized sensory capabilities. How do you think these com-
pare to those found in fish, amphibians, and reptiles?
Image Sources
(1) Eric Guinther. A species of millipede found in Hawaii.. GNU-FDL.(2) Pearson Scott Foresman.
http://commons.wikimedia.org/wiki/File:Thorax_(PSF).png. Public Domain.(3) Jan Derk. A Caribbean reef squid, an example of a cephalopod.. Public Domain.(4) A species of scorpion.. GNU-FDL.(5) ARS.http://commons.wikimedia.org/wiki/Image:
Nest_of_Formosan_subterranean_termites.jpg.(6) Alvesgaspar.
http://commons.wikimedia.org/wiki/Image:Spider_and_mites_May_2008-1.jpg.
CC-BY-SA 3.0.(7) A species of spider in its web.. GNU-FDL.(8) Dr. McVey.http://commons.wikimedia.org/wiki/Image:Reef0296.jpg. Public
Domain.(9) pfly. An echinoderm, the giant California sea cucumber.. CC-BY-SA 2.0.(10) Graham Bould.http://commons.wikimedia.org/wiki/File:
Struthiolariapapulosa(ostrich_foot).JPG. Public Domain.
(11) Mila Zinkova.http://commons.wikimedia.org/wiki/Image:
Monarch_butterflies_cluster_in_SC_3.jpg. GNU-FDL.