acoustic
adaptation
adapted
airbreather
amazon
america
animal
aquatic
biodiversity
current
discharges
ecology
eel
electric
electric eel
electricity
electrocytes
electrolocation
electrophorus electricus
electroshock
eukaryotic
evolution
finned
fins
fish
fresh
freshwater
gill
gillbearing
gymnotiformes
hearing
hunters
knifefish
living
main
movement
organ
orinoco
sachs
scales
shock
south
south america
spines
squamate
swim
tail
vertebrate
voltage
water