Entomology (Study of Bugs)/what insect is this?

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Question
insect
insect  

insect image
insect image  
The insect is about 5mm in length.ovoid shape shield/shell.sometimes the worm head will appear out of its shield like how a tortoise does and when you are nearby it,it hides itself within the shield again.the shell is usually greyish white,sometimes darker in colour.please help.

Answer
Carmen,

This is called a plaster bagworm and is a type of clothes moth. The larva lives inside the sac that it makes from bits of fabric. They can damage natural fibres (silk, wool) but are otherwise harmless. See http://www.livingwithbugs.com/clothes_moth.html for general information about clothes moths.

Jack DeAngelis

Entomology (Study of Bugs)

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Jack DeAngelis

Expertise

I can answer questions in any area of entomology (study of insects, spiders, mites, ticks, and other terrestrial arthropods). Contact me about home and garden insects, insects that bite and sting, and insects that damage homes such as carpenter ants and termites.

Experience

20 years as university extension entomologist, now retired; currently publish a website about home and garden insects.

Publications
see www.livingwithbugs.com/resume.html

Education/Credentials
Ph.D. in Entomology

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