What is the most complex or largest habitat (e.g., beaver dam, bird's nest) created by animals?

Question

I thought I saw on National Geographic a structure made from mud by some animal that resembled natural (e.g., adobe) buildings. It looked like it was about the size of a basketball court (or maybe even bigger).

Answer 1

Easy...

CORAL REEFS.

Answer 2

for their size, termites make some pretty impressive homes for themselves.

Answer 3

coral reef can be thousands of miles long

Answer 4

Wow This is a very interesting question...   I looked just about every where that i thought possible for the answer and as previously stated I could only find Coral as well..... If something different comes up I would love to know...Great Question!!!

Answer 5

I'm goin' with the technicality here.  Cities.  Humans are animals, we created cities, they're pretty complex and large, so I'd say humans...Naked mole rats make pretty cool colonies too though

Answer 6

Termites mounds of certain species in Africa and Australia.  They are large complex towers, made of waterproof cement from soil and saliva.  It insulates against the heat and has a system of air ducts to keep it cool inside.

Temperature regulation is so precise that the nursery chamber doesn't vary more than 2 degrees.  

No structure in the animal kingdom, short of human architecture, can compete with it.