crawler

1. A child who is able to creep using its hands and knees but is not able to walk.
2. A crawl swimmer.
3. A tractor crawler, a motorized vehicle that uses caterpillar tracks instead of wheels.
4. A software bot that autonomously follows connected paths such as links between web pages.
5. A mobile stage in the development of stationary hemipteran insects such as scale insects—generally the first instar.
6. Synonym of crawler crane.

Plural crawlers