Postings of micro-blogger "cora liebo" narrating the list of animals "released" in the southwestern province of Yunnan have left jaws dropped all over China.
One such posting in April listed bedbugs among the creatures released, along with 58 kilograms of snakes.
These releases have been going on for some years and have included many bizarre species, alien to Yunnan, including the notoriously invasive apple snail, which has caused severe damage to rice crops across Asia.
"Taking golden apple snails as an example. It is a species from South America that has strong adaptive and reproductive capacity.
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"It will damage paddy field ecology, affect the growth of crops and will reduce the population of native species, perhaps even to extinction," he was quoted as saying state-run Xinhua news agency.
The forest public security bureau in the provincial capital Kunming are investigating the case.
Releasing animals into the wild dates back to the Han Dynasty (202 BC- 220 AD).
A media report last month said that more than 300 foxes and raccoon dogs had been released in a suburban area of Beijing without authorisation.
Local people complained that the foxes had attacked their chickens.
According to Chinese law, freeing wild animals requires authorisation and the environment must be suitable for the animals' survival.
All the foxes and raccoon dogs were raised in captivity.
The bureau recovered more than 100 foxes, many already dead, presumably from starvation as the animals were not equipped to survive in the wild.
Kunming police believe the unregulated releases have given rise to a black market for trafficking and hunting of wildlife.
Legislation is needed to stop these releases, along with heightened public awareness, Rao said.
When examining an amendment to the wildlife protection law during a session of the Standing Committee of the National People's Congress (NPC) on April 27, committee members suggested China should enhance supervision over animal releases.