Both these translations are correct, but they would be so much more natural with contractions!

"They're really dangerous when they're hungry."

Got it. Just the 'tail' of my business email communication in Boeing

Just "force of habit" from...

If only it would be possible to know all existing idioms... I said the "tail" because we say so when something is in the past, and I retired in April, and now I am free as a bird. But the tail is still here🦎

I figured that was what you meant – we say the same thing in Spanish :-)

You can say "it's just force of habit from my days with Boeing writing business emails."

We also have the same idiom - сила привычки. However, "хвост" sounds very informal and humorous.