Non-PRO English to Portuguese Other Zoology Baleias

"Killer whales, orcas, are hunting together. Seven of them – including a juvenile and a baby – circling a seal that’s stretched on the ice like an entrée on a silver platter. The seal maneuvers to stay in the center – obviously aware of its’ dangerous predicament, while the orcas propel themselves up, almost half way out of the water to get a fix on the seal’s changing position.
It’s a behavior known as ‘spy hopping.’"

Se alguém me poder ajudar com a expressão, fico muito agradecida :).