There are nine known species of lovebirds in genus agapornis, all of which are highly social and known for deeply affectionate monogamous pair bonding, from whence their English name derives. Similar German and French versions are die Unzertrennlichen and les inséparables. The avian species have a corollary in homo sapiens; however, many individuals of the human variety tend to be less spontaneously affectionate than do their avian counterparts, and often search out other sources for agapornis. This extra-monogamous behavior is particularly observable in, though not restricted to, males. Mid-February seems to signal lovebirds to begin elaborate courtship displays: they gather shiny objects and sweets, in order to demonstrate the strength of their pair bonds. Single lovebirds will tend to stay in their nests, or make elaborate displays of disinterest in the courtship rituals around them.