Misc: These letters define what - NATO?

Questions

Kittens are born both blind and deaf, but the vibration of their mother's purring is a physical signal that the kittens can feel - it acts like a ----------, signaling them to nurse.?

---------- herds post their own sentries. When danger threatens, the sentry raises its trunk and though it may be as far as a half-mile away, the rest of the herd is instantly alerted. how this communication takes place is not understood.?

At birth, a ---------- is smaller than a mouse and weighs about four ounces.?

---------- can clock an amazing 31 mph at full speed and cover about 3 times their body length per leap.?

Elephant tusks grow throughout an elephant's life and can weigh more than 200 pounds. Among Asian elephants, only the males have tusks. Both sexes of ---------- elephants have tusks.?