| Participation fee | $0 |
| Expenses | $0 |
| Spend the time | indoors |
| Location | online |
| Children | yes |
| Primary school | no |
| Secondary school | yes |
| Teaching materials | no |
Required Gear:
To listen to the hydrophones, you must be able to receive ShoutCast streams. Advice about appropriate software can be found at http://www.orcasound.net/ under "Listening Guidance."
Killer Whale Tracker
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