Like seals and sea lions, dolphins and porpoises are
often confused for each other. There are a number of
diferences between the two species.
Dolphins are long, and have a distinct pronounced beak,
while porpoises do not. The dorsal fin on a on a porpoise
is smaller and more triangular, than those found on
a dolphin. In most dolphin species the cervical vertabrae
are separated, allowing for fluid movement, in porpoises
a portion of the cervical vertabrae is often fused,
which restricts their "neck" movement.
In general porpoises are smaller than most dolphin
species. Dolphins have cone shaped teeth, while porpoises
have spade shaped teeth. Dolphins are far more prevalant
than porpoises and do to their friendly nature, dolphins
are observed more frequently.