<Tr> <Td> Violet - tailed sylph </Td> <Td> Aglaiocercus coelestis </Td> </Tr> <Tr> <Td> Violet - throated metaltail </Td> <Td> Metallura baroni </Td> </Tr> <Tr> <Td> Violet - throated starfrontlet </Td> <Td> Coeligena violifer </Td> </Tr> <Tr> <Td> Viridian metaltail </Td> <Td> Metallura williami </Td> </Tr>

How many different types of hummingbirds are there