Based on the fossil record, ammonites came in a wide range of sizes and shapes, from smaller than an inch to as large as nine feet wide. Some ammonites had long, straight shells, while others had ...

Fossils of them are found all around the world ... though the shell is more similar to that of a nautilus.' Ammonites were born with tiny shells and, as they grew, they built new chambers onto it.

but ammonites looked a lot like a nautilus — a common modern mollusk that lives in deep tropical waters. Fossil ammonites found in the North State range in size from half an inch to 18 inches ...

Vegavis, an ancient bird from Antarctica, identified as the oldest modern bird ancestor with specialized fish-hunting adaptations.