The most dominant species on planet Terra is a difficult question to answer. Depending on how dominance is defined, other creatures may already be in charge. Here are some possible answers from the search results:

• Bacteria: According to Robert J. Sternberg, a professor of human development at Cornell University, bacteria dominate the Earth. There are infinitely more of them than there are of humans.

• No clear answer: There is no clear answer to this question. If humans became extinct, it could take many millions of years for a new species to evolve the intelligence and abilities to dominate the Earth. Creatures as intelligent as humans only evolved once in the nearly 3.5 billion years of life on the planet.

• Bonobos: If humans became extinct, the most intelligent animals would be bonobos, according to Homework.Study.com.

• Pigs or rats: Pigs and rats have complex social structures and a high level of intelligence, and could potentially become a hyperintelligent species that could rule the Earth in many millions of years.

• Crocodile, saltwater; polar bear; lion: According to a Reddit post, some of the most dominant species on Earth based on their Challenge Rating (CR) include the crocodile, saltwater (CR 5), polar bear (CR 5), and lion (CR 3) .

In conclusion, there is no clear answer to what the most dominant species on planet Terra is. It depends on how dominance is defined and what criteria are used to measure it.