China get warnings silent?

As we all know, there was no warning about the devastating earthquake monday.
Did China know something was going to happen, but kept mum anyways?
Many Chinese bloggers say yes, citing these strange circumstances:
-One blogger from Shandong province, in eastern China, wrote that more than a month ago, he went to his local earthquake resesarch centre several times to report that his animals had been disturbed and restless.
But, he wrote: "They not only ridiculed me, they accused me of making up stories."

-The Chutian Metropolis Daily reported that on April 26, 80,000 tonnes of water suddenly drained from a large pond in Enshi, Hubei province. The province shares a border with Chongqing Municipality, which was devastated by the earthquake on Monday.

-On May 10, a Sichuan-based newspaper, the West China Metropolis Daily, reported that hundreds of migrating toads descended upon the streets of Mianyang, the second largest city in the province which neighbours Wenchuan County, the epicentre of the earthquake.

-In the city of Mianzhu, 60 miles from the epicentre, bloggers pointed to reports just weeks before the earthquake of a mass migration of more than one million butterflies.

-Other bloggers seized upon an as yet unsubstantiated rumour that a Chinese geologist had predicted the earthquake in advance but had been stifled by the authorities, and by fear.