Killer whales(orcas) have this characterisitic.
Orcas do that.
Adult African elephants have no predators other than humans. Elephants calfs predators include lions, hyenas, and crocodiles. When a predator approaches a elephant herd the herd will form a protective circle around the young until the threat leaves.
The protective structure of a rose is the thorns. The thorns grow up and down the stems of the plant. It protects the plant from being eaten.
Placenta.
The Alaskan oil pipeline is a 48" pipe that runs 800 miles from the Alaskan North Slope (where the oil is removed from the ground) to Valdez (where it can be loaded on ships year around because the bay at Valdez doesn't freeze over in winter).
A typical Alaskan cruise starts at around $ 900 per person. This includes your cabin ,meals ,house-keeping ,and room service. Now ,the cheapest alaskan cruise I found cost $699 and you can book the cruise at Alaska Cruises.com
You can find ALaskan cruises at any of the Cruise lines. You would have to plan your trip around when the cruise would take place of course. You can start by looking into Travelocity.
Protective barricade
Really Expensive it's around $4500
Around 2-3 years
The Yukon Wolf (also known as the Alaskan Black Wolf, Alaskan Wolf and Interior Alaskan Wolf; Canis lupus pambasileus) is considered to be the largest gray wolf species in the world, weighing around 150 to 170 lbs (68 to 77 kg) at maturity. However, the Alaskan Tundra Wolf (Canis lupus tundrarum) is thought to be the the heavier version of the Yukon Wolf, with their weight around 180 lbs (80 kg).
No- no atmosphere.