The correct response among the options provided is:
"When leopard seals consume birds, about 10 percent of the birds' energy is transferred to the leopard seals."
This statement aligns with the general rule in ecology known as the 10% rule, which suggests that only about 10% of the energy from one trophic level is transferred to the next higher trophic level. The other options either misinterpret energy transfer or provide incorrect information regarding the roles of organisms within the trophic levels.