{"id":269059,"date":"2025-11-03T15:42:16","date_gmt":"2025-11-03T15:42:16","guid":{"rendered":"https:\/\/www.newsbeep.com\/us\/269059\/"},"modified":"2025-11-03T15:42:16","modified_gmt":"2025-11-03T15:42:16","slug":"titanosaurs-were-the-biggest-land-animals-earths-ever-seen-%e2%88%92-these-plant-powered-dinos-combined-reptile-and-mammal-traits","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/us\/269059\/","title":{"rendered":"Titanosaurs were the biggest land animals Earth\u2019s ever seen \u2212 these plant-powered dinos combined reptile and mammal traits"},"content":{"rendered":"

You\u2019re probably familiar with classic sauropod dinosaurs \u2013 the four-legged herbivores famous for their long necks and tails. Animals such as Brachiosaurus, Apatosaurus and Diplodocus<\/a> have been standard fixtures in science museums since the 1800s.<\/p>\n

With their small brains and enormous bodies, these creatures have long been the poster children for animals destined to go extinct<\/a>. But recent discoveries have completely rewritten the doomed sauropod narrative.<\/p>\n

I study<\/a> a lesser known group of sauropod dinosaurs \u2013 the Titanosauria, or \u201ctitanic reptiles.\u201d Instead of going extinct, titanosaurs flourished<\/a> long after their more famous cousins vanished. Not only were they large and in charge on all seven continents<\/a>, they held their own amid the newly evolved duck-billed and horned dinosaurs<\/a>, until an asteroid struck Earth<\/a> and ended the age of dinosaurs.<\/p>\n

The secret to titanosaurs\u2019 remarkable biological success may be how they merged the best of both reptile and mammal characteristics to form a unique way of life.<\/p>\n

Moving with the continents<\/p>\n

Titanosaurs originated by the Early Cretaceous Period<\/a>, nearly 126 million years ago, at a time when many of the Earth\u2019s landmasses were much closer together<\/a> than they are today.<\/p>\n

Over the next 75 million to 80 million years, the continents slowly separated<\/a>, and titanosaurs drifted along with the changing formations, becoming distributed worldwide.<\/p>\n

There were nearly 100 species of titanosaurs<\/a>, making up more than 30% of known sauropod dinosaurs. They varied greatly in size. From the largest known sauropods ever discovered, including Argentinosaurus<\/a>, Patagotitan<\/a> and Futalognkosaurus<\/a>, whose weight exceeded 60 tons (54.4 metric tons) and were bigger than a semitruck, to the smallest known sauropods, including Rinconsaurus<\/a>, Saltasaurus<\/a> and Magyarosaurus<\/a>, which were around only 6 tons (5.4 metric tons) and about the size of an African elephant.<\/p>\n

Babies to titans<\/p>\n

Like many reptiles, titanosaurs began life comparatively tiny, hatching from eggs no bigger than grapefruits<\/a>.<\/p>\n

The best data on titanosaur nests<\/a> and eggs comes from a site in Argentina called Auca Mahuevo, featuring 75 million-year-old exposed rocks. The site contains hundreds of fossilized nests containing thousands of eggs, some of which are so well preserved, scientists recovered skin impressions from ancient embryos<\/a>.<\/p>\n

\"BlackThe fossilized skin of a titanosaur embryo discovered in Argentina. Courtesy of L. M. Chiappe, Natural History Museum of Los Angeles County, CC BY-ND<\/a><\/p>\n

The sheer number of nests found together, in multiple geological layers, suggests titanosaurs returned to this site repeatedly<\/a> to lay their eggs. The nests are so closely spaced, it\u2019s unlikely an adult titanosaur would have been able to move freely through the nesting ground. Titanosaurs likely had a hands-off parenting style, similar to many reptiles that lay numerous eggs and don\u2019t spend much time tending the nest or taking care of hatchlings.<\/p>\n

A titanosaur hatchling<\/a> would have been roughly 1 foot (30 centimeters) tall, 3 feet (1 meter) long and 5-10 pounds (2.5-5 kg). Recent evidence from a site in Madagascar suggests these tiny titans were born ready to rumble.<\/p>\n

\"AnA titanosaur from Madagascar called Rapetosaurus krausei is known from fossils of tiny hatchlings, giant adults and a variety of in-between sizes. Jordan Mae Harris, CC BY-ND<\/a><\/p>\n

Fossilized bones from the species Rapetosaurus suggest that by the time they would have been just knee high to a modern human, they were likely fending for themselves<\/a>. Microscopic details recorded deep within the bones indicate baby Rapetosaurus likely foraged independently for plants and moved much more nimbly than their lumbering adult relatives.<\/p>\n

For the first century of dinosaur science, paleontologists imagined titanosaurs as giant, overgrown reptiles \u2013 and used reptilian growth rates to predict their milestones<\/a>. In this slow-growth model, even the smallest titanosaurs would have taken nearly a century to reach their full size, meaning they would have been relatively small for a good chunk of their lives. New evidence suggests this growth pattern is unlikely.<\/p>\n

Scientists like me study titanosaurs\u2019 bones at high magnification<\/a> to better understand their growth. We look at the microscopic patterns of bone minerals as well as the density and architecture of the spaces that held blood vessels and cells.<\/p>\n

\"AA thin slice of a juvenile titanosaur femur bone. The linear and circular structures are the spaces where a dense network of blood vessels supplied this fast-growing animal with plenty of nutrients. Kristi Curry Rogers, CC BY-ND<\/a><\/p>\n

The more dense the blood supply is to a bone, the faster that animal grows. These signatures are also present in living animals and can accurately reflect growth rates, anomalies and even age<\/a>.<\/p>\n

Bone data shows titanosaur growth rates were on par with mammals like whales<\/a> \u2013 much, much faster than any living reptile \u2013 meaning they would have reached their enormous adult sizes in just a few decades<\/a>. Scientists can\u2019t know for sure how long titanosaurs lived, but based on large land animals living today, titanosaurs lived possibly 60 or more years.<\/p>\n

Fueled by plants<\/p>\n

The rapid growth rates of sauropods was partly due to their body temperatures. By studying the chemistry of fossilized teeth and eggshells<\/a>, scientists have determined titanosaurs had body temperatures ranging from about 95 to 100.5 degrees Fahrenheit<\/a> (35 to 38 degrees Celsius). That\u2019s higher than that of crocodiles and alligators, about the same as modern mammals and a bit lower than most birds, whose bodies can regularly get as warm as 104 F (40 C)<\/a>.<\/p>\n

Titanosaurs\u2019 rapid growth rates were also powered by their prodigious appetites for plants. Microscopic patterns of scratches, wear and pits on their teeth indicate titanosaurs in Argentina fed on a diverse diet rich in grit, suggesting they were dining on plants found lower to the ground<\/a>, where sediment would be more commonly found.<\/p>\n

In India, chunks of fossilized feces, otherwise known as coprolites<\/a>, show titanosaurs there ingested everything from ground-level plants all the way up to the leaves and branches<\/a> of trees.<\/p>\n

Like all dinosaurs, titanosaurs replaced their teeth throughout life. But data shows they replaced each tooth about every 20 days<\/a> for maximum efficiency, one of the highest tooth-replacement rates known for dinosaurs.<\/p>\n

Had it not been for the asteroid impact 66 million years ago<\/a>, these long-lived, incredibly diverse and wildly successful animals probably would have kept on thriving, in places as distant as Madagascar, Romania, North America and even Antarctica<\/a>. Instead, titanosaurs were among the witnesses to \u2013 and victims of \u2013 the most recent mass extinction on Earth.<\/p>\n

This article is republished from The Conversation<\/a>, a nonprofit, independent news organization bringing you facts and trustworthy analysis to help you make sense of our complex world. It was written by: Kristi Curry Rogers<\/a>, Macalester College<\/a> <\/p>\n

Read more:<\/p>\n

Kristi Curry Rogers receives funding from the National Science Foundation and the David B. Jones Foundation. <\/p>\n","protected":false},"excerpt":{"rendered":"You\u2019re probably familiar with classic sauropod dinosaurs \u2013 the four-legged herbivores famous for their long necks and tails.…\n","protected":false},"author":2,"featured_media":269060,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[62807,144289,79,144290],"class_list":{"0":"post-269059","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-science","8":"tag-metric-tons","9":"tag-sauropod-dinosaurs","10":"tag-science","11":"tag-titanosaur"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/269059","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/comments?post=269059"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/posts\/269059\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media\/269060"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/media?parent=269059"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/categories?post=269059"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/us\/wp-json\/wp\/v2\/tags?post=269059"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}