Alligator mississippiensis (American alligator) (Sanibel Island, Florida, USA) 5 : 無料・フリー素材/写真
Alligator mississippiensis (American alligator) (Sanibel Island, Florida, USA) 5 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Alligator mississippiensis (Daudin, 1801) - American alligator in Florida, USA (January 2016).The crocodilians have been around since the Triassic (early Mesozoic). Crocodilians include four groups: eusuchians (the only living group), mesosuchians (extinct), protosuchians (extinct), and sphenosuchians (extinct). Some fossil crocodilians reached such immense sizes that they preyed on dinosaurs. Another fossil group of reptiles, the phytosaurs (upload.wikimedia.org/wikipedia/commons/d/d2/Rutiodon_BW.jpg), closely resemble crocodilians, but are unrelated (phytosaurs are crurotarsan archosaurs). All modern and fossil crocodilians have the same overall skeletal structure, although some fossils forms did depart somewhat from the stereotypical crocodile body plan (quadrupedal, dorso-ventrally compressed bodies, elongated skull & snout with eyes atop the head). So, the crocodilians are, in relative terms, evolutionarily conservative. Living crocodilians are tropical to temperate, predatory semiaquatic reptiles, but fossil representatives include fully marine forms and inferred terrestrial forms. Only two living crocodilians are native to America - the American alligator and the American crocodile. Both occur in the far-southeastern parts of the USA (Florida). The individual shown above is a medium-sized American alligator - it is about 8 feet long. As are all crocodilians, the alligator is a predator (carnivore), although it is also known to be a frugivore (fruit eater). The breathing rate is slow - I observed between-breath intervals ranging from 1 minute, 10 seconds to 2.5 minutes.Classification: Animalia, Chordata, Vertebrata, Reptilia, Crocodilia, AlligatoridaeLocality: Ding Darling National Wildlife Refuge, Sanibel Island, southwestern Florida, USA |
| 撮影日 | 2017-08-29 16:50:47 |
| 撮影者 | James St. John |
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