In contrast to mayflies, which are small and usually live only 24 hours as adults because they do not eat, fishflies are quite large, their wing span being from 2.5 to 3.
Fishflies are quite large, their wing span being from 2.5 to 3. This is in contrast to mayflies. Mayflies are small because they do not eat. Mayflies usually live only 24 hours as adults. They do not eat.