Crows
Loki had always been a bit edgy around crows. He liked them, certainly. They were messengers and bringers of news and fortune; good or bad. Loki could certainly empathise with this. Just as crows helped or hindered with their presence, so did he. People often killed crows, seeing them as ill omens or even as evil. Loki himself had been cast out of Asgard through Odin's fear. Most likely due to the trickster's ambivalent attitude. The Native Americans always saw the crow as a trickster who helped the world accidentally while trying to help himself. This always made the small God laugh.
Despite this, he tried to keep the birds away from his home. Thought and Memory were the forefront concerns in his mind. Hugin and Munin. As Odin's crows and spies in Midgard, Loki could not afford to let them near him. Best to keep all away than risk letting those two omens in.
oOo
Notes: In Norse mythology, Hugin and Munin are Odin's crows. They bring messages back from Midgard on the activities of Men. Also, Native Americans actually see ravens and crows as separate entities. Also, they really believed that the 'trickster' persona belonged to the raven, rather than the crow, who was related to natural order and law. As you can see, I had reason to twist it.