a wasp
insecta
The European paper wasp makes its nest out of mud.
If referring to the nest of a Mud Wasp, then about the size of a soccer ball
The structure you are referring to is likely a mud dauber wasp nest. Mud dauber wasps use mud to create nests, which are typically small, cylindrical structures attached to walls or other surfaces. The nests can be mistaken for tiny mud homes.
Yes - there are many types of wasps in California including: German yellowjacket, western yellowjacket, California yellowjacket, paper wasp, mud dauber, fig wasp, Western sand wasp, square headed wasp, bee wolf, Pacific burrowing wasp, gall wasp, soldier wasp, club horned wasp, burrowing wasp, blue mud wasp, cutworm wasp, thread-waisted wasp, mason wasp, potter wasp, and pollen wasp. Obviously this is not a complete list - just scratching the surface really - but it does demonstrate that California has plenty of wasps.
10 years
Assuming I understand your question, it's not a bee. It's a mud dauber -- a type of wasp.
The bird that builds a nest that looks like mud is called a mud dauber wasp.
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.
The potter wasp uses mud The European wasp ( USA yellow jacket ? ) chews wood The carpenter bee drills a horizontal hole in wood.
Potential dangers associated with wasp mud tubes include the risk of getting stung by the wasps, which can cause pain, swelling, and allergic reactions in some people. To safely remove wasp mud tubes from a property, it is recommended to wear protective clothing, use insecticidal sprays or dusts specifically designed for wasp control, and to do so during the evening when the wasps are less active. It is also advisable to seek professional help if the infestation is large or if you are unsure about how to safely remove the wasp mud tubes.