Crossword puzzle clue "they're constantly picking up"

They're constantly picking up

Creatures that can't move but have sex by constantly and simultaneously ejaculating on a full moon once a year. It's called "broadcast spawning" and there are videos and they are glorious

They're used for picking things up

Lead ___-and-dog life (constantly quarrel)

“Harry Potter” spell useful for those constantly losing their keys

Be ___ (constantly complain)

Constantly vigilant

___ time (constantly)