The Screemies!

2nd of 4 stories published in Yellow Claw #4, 04/1957.
Screemies is the name given by an associate of the Yellow Claw for a new subspecies of sea gulls which he reckons came too close to the atomic tests at Bikini Atoll. These creatures have arms with hands and with a voracious appetite. The Yellow Claw sees a great use for them as a weapon.