Translation of "Their presence" in Japanese

What makes these beautiful assassins even more dangerous is their power to conceal their presence.

この殺し屋の危険度を 高めるのは身を隠す能力です

[Richard] They can use these little pincers to hold bits of coral rubble and algae on top of themselves to help camouflage their presence.

管足(かんそく)でサンゴ片や藻をつかみ 体を覆って カモフラージュする