2012年,在科羅拉多莫里遜組的露頭顱溪採石場(Skull Creek Quarry)發現了一具尚未描述、55%完整度的標本,暱稱為「貓王(Elvis)」,包含骨盆、脊椎、後肢、完整關節連接的背骨、上頜骨與顱骨材料,是目前發現過最完整的蠻龍標本。[21]根據該標本架設的骨架模型,其中缺失部分用其他蠻龍標本模型來補齊,現展示於辛辛那提自然史與科學博物館。[21][22]
2013年Araújo等人公開了ML1188標本的發現,是一堆恐龍蛋碎片及胚胎化石,被認為屬於蠻龍。此項發現進一步支持大型獸腳類為卵生的假設,代表牠們會產卵,胚胎發育發生於雌性體外。這是於2005年由荷蘭業餘化石獵人阿特·瓦楞(Aart Walen)在葡萄牙西部洛里尼揚組(英语:Lourinhã Formation)約1億5200萬至1億4500萬年前侏儸紀提通階的河相沉積地層中發現。在古生物學上有以下幾個重要意義:①是已知最原始的恐龍胚胎②是唯一已知的基礎獸腳類胚胎③蛋和胚胎化石很難得同時發現④是獸腳類為單層蛋殼的首個證據⑤使研究人員能夠將蛋殼形態與特定獸腳類族群骨學聯繫起來。[18]標本目前存放於洛里尼揚博物館(英语:Museu da Lourinhã)。這些蛋被單獨遺留的原因不明,目前無法得知蠻龍是否會為蛋及幼崽提供親屬照護、還是在產卵後直接遺棄。[37]然而蛋殼表面有大量細孔,讓內外介質間有足夠的氣體交換,代表蛋是埋在基質內孵化,方式類似現代海龜。埋藏環境無干擾跡象、低能量流動的地質環境亦證明了此觀點。[18]
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