Jaques d'Alltrades wrote:
[...]

They're daddy-long-legs / crane flies. Mayflies hatch from water:
aka
caddis fly, the grubs make a protective jacket of débris and carry
it
about. May be of grass, reed, and twig detritus, or small pebbles
and
bits of shell.
[...]

Some people call caddis "mayflies", but it would mislead a fisherman.

--
Mike.