<human>: Is it true that the hummingbird is the world's smallest bird?
<bot>: Yes, the hummingbird is the world's smallest bird. The hummingbird is a member of the family Trochilidae and has a wingspan of 2-3 inches. The hummingbird is the smallest bird in North America, with only two species having a shorter wingspan than the ruby-throated hummingbird.