Frogs are mostly thought of as non aggressive animals but
there are some species who show territorial defense. Defending
popular areas of feeding shelter and breeding. Mostly it's
the males that are aggressive to other males especially during
Many frogs 'call' to warn other frogs away from their territory.
The frogs voice can be an indication of it's age, health and
size, so showing what possible match it might be to an intruder.
Frogs of a similar size ad strength seem to fight most as
smaller frogs tend to run away from larger aggressors. Colour
change can also be used as a deterrent.
The Water Helmeted Toad, Caudiverbera caudiverbera,
inflates itself and rises on all it's legs, then calling leaps
at predators to scare them away.
In species that fight, spines can grow on their thumbs, arms
or chest. Female fights can involve kicking, leaping and holding
the other frogs head. Other fighting methods include shoving
with the chest, leaping on the opponent's back and aggressive
The gladiator tree frog (Hyla boans) have a sort of
spiny growth on the back foot that is used in combat, which
can even fatally wound others of the same species.
African Bullfrogs are very protective parents and will attack
any thing that approaches their eggs or tadpoles, including
frogs, human and any other animal.