Cellphone footage captured the kid quietly fishing near the shoreline when suddenly the “beaver exited the lake and charged him” in a ferocious frenzy, police told News 12 New Jersey.
“The child began to run away but tripped. The animal bit the child in the upper thigh and continued to attack him,” authorities said, per News 12.
Horrified relatives ran to help the boy and tried to drive the raving rodent away, but the disease-maddened beast maintained the assault.
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Finally, as a pet dog joined in the battle, a relative kicked the beaver away and someone managed to grab the animal and fling it out into the lake.
Beavers typically measure as long as four feet and weigh up to 70 pounds, and sources say this crazed critter refused to leave and continued “to circle the area,” per a local Patch report.
The wounded boy was then rushed to a hospital for treatment.
Later, animal control officers captured the beaver and determined it was suffering from rabies and said the malady plunged the animal into a raging attack mode.
Police also learned that the animal had attacked others in the park earlier and all the victims would need treatment.
According to the World Health Organization, rabies is 100 percent fatal to humans once symptoms appear, but is curable if treated immediately after exposure.
Symptoms include nausea, vomiting, hydrophobia — an irrational fear of water — and delirium.
Treatment involves thorough washing of the wound followed by a dose of Human Rabies Immune Globulin and then four doses of rabies vaccine over a 14-day period.