13micrometers
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The smallest ciliate is likely around 10 micrometers in length. Some species can be even smaller, but they are typically very hard to observe and study.
ciliate
No, the bee hummingbird is the smallest bird. Canaries are small birds but not the smallest.
The small intestine
The smaller nucleus of a ciliate is called the micronucleus, and it is responsible for genetic variation and sexual reproduction. It contains backup copies of the cell's genes, which are used during conjugation to exchange genetic material with another ciliate.
The Western Pygmy Blue (Brephidium exilis) is considered the smallest butterfly in the world. It has a wingspan of about 0.5 inches.