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Dino Vocalizations: My Previous Attachment
I've been advised that some of you are having trouble retrieving the
attachment in my most recent message. I'm going to try pasting it directly
into this message. Here's hoping!
Title: Blasts From the Past: Ancient Melodies
by Della Drury
Questions: 1. What vocalizations may have been produced by hadrosaurian
dinosaurs using the resonating chambers in their crests?
2. Is there any evidence that hadrosaurian dinosaurs had
soft tissue structures that would have let them
change the size of the resonating chamber in
3. Could the lateral diverticula in the crests have been
used to modify the vocalizations?
4. Is there any evidence of vocal cords or their supporting
boney structures in the throats of hadrosaurian
dinosaurs? (If these structures existed, they may
have changed the pitches or complexity of the
5. Could some adult hadrosaurian dinosaurs have produced
frequencies that their predators could not hear?
Hypothesis: Hadrosaurs used their crests as resonance chambers to produce
low frequency vocalizations which their predators could not hear.
Procedure: 1. Collect data from each of the following sources:
c) internet articles
d) paleontology bulletin boards
e) postal letters from museums
f) e-mail from paleontologists
2. Based on the best data from the above sources, build a
plastic pipe model of a Parasaurolophus nasal cavity.
3. Calculate resonant frequencies based on measurements
from the literature and, more specifically, of the
4. Generate various frequencies using the model and measure
the frequencies using either an oscilloscope or a
frequency counter. Compare the measured and
5. Find data on the length of the cochlear ducts in the ears of
predators which may have eaten hadrosaurs. Use
these lengths to calculate the lowest frequencies
these animals would have been able to hear.
Compare these frequencies to those which hadrosaurs
would have been able to produce.