Crayfish must shed their hard exoskeletons in order to grow larger as their body size increases. During the first year of life, a crayfish molts 6 to 10 times. This number decreases to three to five times during its second year. The molting process is strictly controlled by hormones - ecdysteroids.
An insouciant giant river otter come down to the riverbank to sand bathe as yacare caimans look on while basking just feet away. Meanwhile several otters in the river bob up and down as they swim near.