What is the greatest animal architect?

Dams, towers, apartment blocks and one structure that holds a world record for sheer size. Engineering without hands.

1. 1
   Termite

   Raises mounds several metres tall with passive ventilation that keeps the interior at a steady temperature.
   1000pts
2. 2
   North American Beaver

   Builds dams that reshape whole watersheds; one in Alberta is visible from orbit.
   984pts
3. 3
   Coral

   Colonies of polyps that have built the largest living structure on the planet.
   891pts
4. 4
   Satin Bowerbird

   Builds and decorates a bower purely to be judged on it by females.
   848pts
5. 5
   Caddisfly

   Larvae build portable cases from sand and twigs; given gemstones, they build with those.
   636pts
6. 6
   Hamerkop

   Builds a domed nest more than a metre across that supports the weight of a person.
   636pts
7. 7
   Trapdoor Spider

   Builds a silk-hinged door flush with the soil and holds it shut from underneath.
   636pts
8. 8
   Paper Wasp

   Makes paper from chewed wood fibre, several thousand years before humans did.
   495pts
9. 9
   Bald Eagle

   Holds the record for the largest bird's nest ever measured: 2.9 metres wide and over two tonnes.
   495pts
10. 10
    Western Honey Bee

    Builds hexagonal comb, the most material-efficient way to tile a plane.
    495pts
11. 11
    Sociable Weaver

    Constructs communal thatch nests that house a hundred pairs and last a century.
    495pts
12. 12
    European Garden Spider

    Rebuilds a full orb web most nights, eating the old silk to recycle it.
    495pts
13. 13
    Leafcutter Ant

    Excavates nests with millions of chambers to farm a single species of fungus.
    318pts
14. 14
    Prairie Dog

    Digs towns with nurseries, listening posts and separate latrines.
    318pts
15. 15
    Baya Weaver

    Weaves a hanging flask-shaped nest with a long entrance tube against snakes.
    318pts