passionflower (Passiflora alata)
Caption: Picture modified from Gilg, Ernst; Schumann, Karl - Das Pflanzenreich Hausschatz des Wissens (1900) - Permission granted to use under GFDL by Kurt Stueber. Source: www.biolib.de - Permission is granted to copy, distribute and/or modify this image under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.

passionflower (Passiflora lutea)
Caption: USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. Vol. 2: 565.

Passenger Pigeon (Ectopistes migratorius)
Caption: Picture modified from Anton Fritsch - Evropské ptactva (Europas Vögel), Tafelband (1871) - Permission granted to use under GFDL by Kurt Stueber. Source: www.biolib.de - Permission is granted to copy, distribute and/or modify this image under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

Passenger Pigeon (Ectopistes migratorius)
Caption: Brehm, Alfred Edmund; Pechuel-Loesche, Eduard; Haake, Wilhelm - Brehms Tierleben. Allgemeine Kunde des Tierreichs. Vögel - Zweiter Band. (1891) - Permission granted to use under GFDL by Kurt Stueber. Source: www.biolib.de - Permission is granted to copy, distribute and/or modify this image under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.