去主站看了一下，最后一条似乎是原作者根据评论区修改的。
第一版写的是放进了一只蜘蛛：

Brown Recluse spider larvae - Several 9 feet tall Brown Recluses, which killed 3 Containment Teams before a Level 5 lockdown was initiated.
隐居褐蛛幼虫 - 数个9英尺高的隐居褐蛛，在5级封锁前杀死了3个收容小组。

然后，评论区有人提出意见：

Why put the spiders in it? It seems like it would be an obviously bad idea before even conducting the experiment.
为什么把蜘蛛放进去？在进行实验之前就能看出这显然是个坏主意。

另一个人提议放苍蝇幼虫进去：

…an absolutely terrifying monster fly that wreaked havoc on the site, …an innocuous but extremely annoying, nigh unkillable/uncapturable fly that annoyed everyone so much and had a high possibility of escaping and breeding true that the entire site needed to be shut down.
…一只在现场造成严重破坏的绝对可怕的怪物苍蝇，…(或者)一只无害但极其恼人、几乎不可杀死/驯服的苍蝇，它让每个人都非常恼火，并且很有可能逃跑和繁殖，所以站点需要关闭。

然后就是现在看到的版本了。