国产诱惑福利

鈥淚t鈥檚 a very rare event, but it is a really wonderful demonstration of just how wide-ranging these animals are,鈥� said Phillip Clapham, former head of a NOAA whale research program who was not involved with the new findings.

are known for roaming long distances across major oceans in predictable patterns, learned from their mothers. They feed on krill and small fish in the warmer months and breed in tropical waters over winter.

It's difficult to track the movements of creatures that spend most of their lives underwater. In the new study, scientists analyzed over 19,000 whale images taken in the past four decades by research groups and citizen scientists.

Recognition software helped to identify the whales based on their tails' color patterns and jagged edges. Researchers pinpointed two different whales at breeding sites in eastern Australia and Brazil over the years, suggesting they had crossed from one place to the other.

One whale traveled just over 9,300 miles (15,000 kilometers), outranking previous recordholders including a humpback that swam from Colombia to Zanzibar.

The findings were published Tuesday in the journal Royal Society Open 国产诱惑福利.

Since the photos only depict the whales at the beginning and end of their journeys, researchers don't know the exact route they took.

Whales don't typically travel between mating sites so it's not yet clear why these two separately embarked on their journeys. They may have met other whales on shared feeding grounds and split off instead of returning to where they came from, study co-author Stephanie Stack with the Pacific Whale Foundation said in an email.

鈥淔inding not one but two individuals that have crossed between Australia and Brazil challenges what we thought we knew about how separate these populations really are,鈥� Stack said.

Such odysseys are more difficult for whales in the Northern Hemisphere, where massive continents make traveling across oceans tougher.

Scientists said the record journey shows just how far humpback whales can go. These methods can also help keep track of them as climate change warms oceans, possibly changing where krill live and where humpbacks might go to feed and breed.

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