Islandia or Iceland, by Abraham Ortelius, 1590.

Public Domain.

The English Whale From the Map of Islandia or Iceland, by Abraham Ortelius. 1587.

Abraham Ortelius, Public domain, via Wikimedia Commons

Size of the Eocene protocetid Peregocetus compared to a human.

Conty, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

Ambulocetus size compared to a 1.8 m tall man

PaleoNeolitic, CC0, via Wikimedia Commons

Maiacetus, National Museum of Natural History

Cliff from Arlington, VA (Outside Washington DC), USA, CC BY 2.0 <https://creativecommons.org/licenses/by/2.0>, via Wikimedia Commons

Georgiacetus vogtlensis, a primitive whale from the Late Eocene of Georgia (USA), by Nobu Tamura.

Nobu Tamura (http://spinops.blogspot.com), CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons

Some Early Relatives of Modern Whales.

Ana Claudia Rocha e Charbel Niño, CC0, via Wikimedia Commons

Restoration of the Eocene protocetid Peregocetus, laying on a cliff. Size and body shape is based on the holotype fossil.[1] Head based on known skulls from other protocetids.

Conty, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

Rodhocetus.

Pavel.Riha.CB, CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>, via Wikimedia Commons

Phylogenetic relationships of early cetaceans showing the temporal ranges and general relationships of Pakicetidae, Ambulocetidae, Remingtonocetidae, Protocetidae, and Basilosauridae

Alexandra Houssaye, Paul Tafforeau,Christian de Muizon, Philip D. Gingerich, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

Mosaic with a ketos (sea monster) found at Caulonia (Monasterace) in the Casa del Drago, 3rd century BC, Monsters. Fantastic Creatures of Fear and Myth Exhibition, Palazzo Massimo alle Terme, Rome

Carole Raddato from FRANKFURT, Germany, CC BY-SA 2.0 <https://creativecommons.org/licenses/by-sa/2.0>, via Wikimedia Commons

Johann Bayer - Cetus, 1603.

Johann Bayer, Public domain, via Wikimedia Commons

Illustration from a copy of Al-Sufi's "The Book of Fixed Stars". This copy was made in Prague in the 15th C and is known as "Catalogus Stellarum Fixarum", Codex DA 11.13. Detail of Leviathian or Cetus

See page for author, CC BY 4.0 <https://creativecommons.org/licenses/by/4.0>, via Wikimedia Commons

From Adriaen Coenen's Visboeck, or Fish Book.

Koninklijke Bibliotheek, Public domain, via Wikimedia Commons

Koninklijke Bibliotheek, Public domain, via Wikimedia Commons

Life reconstruction of Ambulocetus natans

Nobu Tamura email:nobu.tamura@yahoo.com http://spinops.blogspot.com/, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons