Huginn and Muninn
Hugin and Munin are Odin's two raven familiars.
MOVIE BIO: THOR[]
Odinsword
During Thor's coronation in 2011, they were present, sitting atop either side of Odin's throne.
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MOVIE BIO: AVENGERS[]
AVENGERS Hugin and Munin
A year later, during Loki's invasion of Earth, the ravens followed Thor to Earth, possibly to observe the conflict and relay the information to Odin. When Thor took Loki from the Quinjet, they could be seen perched on some rocks just before Thor and Loki slammed into the ground, and were later seen flying by the mountaintop while the brothers were talking.
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MOVIE BIO: THOR 2[]
THOR 2 Hugin and Munin
One of the birds flew down to Odin's arm, when he greeted Thor after his return from restoring peace in Vanaheim.