Rare term for penguin; the common word is ペンギン. This is a taxonomic-style compound (人鳥 + 類) meaning 'penguin kind'.
See also: ペンギン
人鳥類 is one of the old names for penguins.
Compound of 人鳥 (jinchō, 'penguin', literally 'person-bird') and 類 (rui, 'kind, category'). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.