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These swallow-like Familiars are everywhere in Kamihama. The seem to be collecting magic as offerings to their Witch. They target Magical Girls and steal not only their magic but also their memories, visions and even emotions. They have also been known to target other Witches. Hunting in a group, they utilize their anchor-shaped legs to capture them. They are uninterested in normal humans without magic, because they don't make good offerings.

These minions resemble swallows, and can be seen in various places throughout Kamihama City. They seem to be collecting magic energy from various places as offerings for their master.
Their targets include Puella Magi and rival witches. They steal raw magical energy from Puella Magi at first, before moving on to stealing memories, eyesight, and even emotions as offerings. They’ll even hunt down other witches by fighting in packs, making use of their legs which shapeshift into anchors.
Regular, non-magical humans seem to make for crude offerings, so these minions have no interest in them.