trope-a-day
Rubber Forehead Aliens: Averted. With the irrelevant caveat mentioned under Human Aliens, anything that looks like it belongs to/is descended from a particular species almost certainly does/is. See also Starfish Aliens.
blogging from a to z
xenognosis (n.): (also “the Big Hello”) The knowledge that sophont species other than one’s own exist; also, the discovery by an individual or species that they exist. In popular mythology, this is usually conflated with first contact, or at least with the establishment of genuine communications between the species