The 32 species that make up the dolphin family are closely related to whales and in fact include the animal known as the killer whale, which can grow to be 30 feet long and is famous for its aggressive hunting pods.
include the animal known as the killer whale, which can grow to be 30 feet long and is
include the animal known as the killer whale, growing as big as 30 feet long and
include the animal known as the killer whale, growing up to 30 feet long and being
include the animal known as the killer whale, which can grow as big as 30 feet long and is
include the animal known as the killer whale, which can grow to be 30 feet long and it is
"can grow as big as 30 feet long" is definitely correct. But when it is put with "can grow to be 30 feet long", native English speakers will go with the latter because the latter is more concie and hence better.