The Amazon basin is the largest hydrographic basin in the world, its rivers and streams harbor the highest diversity of freshwater fish on the planet, with more than 2.400 described species, being ...

Brain of Pseudopimelodus bufonius, MZUEL 5744, 118.2 mm SL, in (a) dorsal, (b) lateral and (c) ventral views, and (d) dorsal and (e) ventral views of olfactory organ. bol: bulbus olfactorius; ch: ...

There have been surprising revelations in the crocodile world as of late: DNA analysis has revealed that two reptiles once ...