What was the secret behind this bird toy’s rocking and singing?

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Since battery-operated toys only started to appear in 1959, most toys that moved throughout the rest of the decade did so mechanically. So, for this bird to move and sing, it had to be wound up.
vimalartcraft/eBay.com
vimalartcraft/eBay.com
What was the secret behind this bird toy’s rocking and singing?
- Wind-Up Mechanics
- False Advertising
- The Wind
- Batteries
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