Originally Posted by The Vorpal Tribble
Crow at Midnight(Ex): A coalblack cock that crows does not produce sound, but an intense silence. This acts as a Silence spell by a 10th level caster. The cock can continue the crow as a standard action, and can continue for a number of rounds equal to it's Constitution modifier.
Do you mean start to crow instead of continue? Otherwise I'm confused about what this actually means.