Scientists refer to aquatic-snails nests appearing bubble-shaped or similar to a cocoon where pairs of snails reproduce every 6 days or few weeks.
Sugar ant nests can be found between rocks and in holes in the woods. Their nests usually look like raised hills with a hole in the middle.
Owls do make their own nests.In fact they look alot like birds nest's but bigger.
Flies do not make nests, they lay their eggs directly on a food source.
Zebra's behave pretty much like horses and don't have "nests". They lay down when and where it suits them.
Squirrels build nests kind of like birds do. They pretty much look like bird's nests, and if they build them inside a tree, it looks like a nest inside a birdhouse does.
Finch nests look like a normal bird nest with a top encompassing most of the nest. Sortta like an igloo. There's a tunnel that leads to the main nesting area. Pretty complex design compared to most bird nests. I have one on my front porch in a hanging plant basket. It has about 4 eggs in it last time I looked.
They sound like anthills the way you describe it. Ants will build little nests that look like that.
Hawk nests are just mats of sticks, placed on an elevated cliff, or in the fork of a tree.
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There are three main types of wasp nests: paper wasp nests, mud dauber nests, and yellowjacket nests. Paper wasp nests are made of a paper-like material and have open cells. Mud dauber nests are made of mud and have closed cells. Yellowjacket nests are made of paper and have a papery covering. These nests differ in their construction materials and appearance.
Squirrel nests, also known as dreys, are typically round structures made of twigs, leaves, and other materials. They are often found high up in trees and can resemble a large ball of leaves and branches.
There are three main types of wasp nests: paper wasp nests, mud dauber nests, and yellow jacket nests. Paper wasp nests are typically umbrella-shaped and made of a paper-like material. Mud dauber nests are made of mud and have a cylindrical shape. Yellow jacket nests are usually found underground or in cavities and are made of a papery material. These nests can be identified by their shape, location, and the materials used to construct them.