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[13] [14] There are claims of São Francisco piranhas at up to 60 cm (24 in), but the largest confirmed specimens are considerably smaller. [15] The extinct Megapiranha which lived 8–10 million years ago reached about 71 cm (28 in) long, [ 16 ] and possibly even 128 cm (50 in).
To emphasize the diversity of diets, authors commonly highlight the fruit- and leaf-eating pacus and the highly carnivorous piranhas. Most in the family other than piranhas are primarily herbivorous. In contrast, piranhas have been long believed to be strict carnivores. [4] Many species change diets depending on age and resource availability. [4]
Serrasalmus is a genus of piranhas. They are collectively known as pirambebas; the "typical" piranhas like the piraya piranha are nowadays placed in Pygocentrus. Like all piranhas, Serrasalmus are native to South America. These fish are predatory, have sharp teeth and generally have a rhomboid shape.
While studying piranhas and pacus in an effort to better assess vital fish biodiversity in the 4,000-mile-long (6,400-kilometer-long) ... There is also a species of tree frog, ...
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Red-bellied piranhas often travel in shoals as a predatory defense, as well as for the offense. In studies that tested the piranhas' reactions to a simulated predator attack, resting opercular rates returned to normal more quickly among piranhas that were in shoals of eight rather than in shoals of two. Although it has been presumed that ...
Around 2,000 years ago, they were still common in many parts of China. Around 12,000 years ago, they also lived in Borneo. Today, you can only find Javan rhinos in one place on Earth, the Ujung ...
It is estimated that there were once thousands of vaquitas swimming in the Gulf of California. However, researchers completed the first survey of their numbers in 1997 and estimated the population ...