How many feather-winged beetles would it take to make a meter?

According to the Encyclopaedia Britannica feather-winged beetles is a family of beetles that are between 0.25 and 1 mm although some of them can grow to 2 mm. In other Words, there is no one single animal with that name we can use.

A millimeter is 1/1000th of a meter, so you need 1000 mm to make a meter. -> so you need 1000*1 mm beetles to fill that meter or 500 beetles if they're 2 mm.

Beetles of 0.25 mm are 4 times as small as 1 mm, so you need 4 times as many of them to fill the same meter. 1000 beetles*4= 4000 beetles.

In short to fill a meter with feather-winged beetles, you need 500-4000 beetles depending on the size of beetle you're using.