Ferocity is short-lived

A close friend, an Internet freak, was shooting questions.
* Do you know mosquitoes have 47 teeth?
“Nope,” I replied.
He went on.
“No two zebras have stripes that are exactly alike. A giraffe’s kick is so powerful that it can decapitate a lion. At least do you know that a hippopotamus can run faster than a man?
“Shut up, don’t make me feel that I do not know anything,” I fumed and continued: “I know about tigers which I heard from Shaadaab. Tigers do not attack face to face, but from behind. In order to avert tiger attacks, some forest rangers wear masks behind their head to mislead them. Tigers also stink a lot. And I know about lions also because I am a lion myself. A lion’s roar can be heard five miles away.”
“But why do you get angry? Like tigers’, your ferocity also should be shortlived,” my friend replied.
“What do you mean?”
“Oh, you don’t know tigers do not live for more than 15 or 20 years.”
I felt I had grown a tail after this conversation.