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A trend first observed in the evolution of the earliest tetrapod's was feet with digits.
What is a tetrapod?
Tetrapods are four-limbed vertebrates that make up the superclass tetrapoda. Extant and extinct amphibians, reptiles, and synapsids are included.
Tetrapods descended from the Tetrapodomorpha, which descended from ancient lobe-finned (sarcopterygian) fish around 390 million years ago in the middle Devonian period; their forms were intermediate between lobe-finned fishes and four-limbed tetrapods.
What animals are considered tetrapods?
Amphibians, reptiles, birds, and mammals are all members of the tetrapod group of vertebrates. All living land vertebrates are classified as tetrapods, as are some former land vertebrates who have since developed an aquatic lifestyle such as whales, dolphins, seals, sea turtles, and sea snakes.
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