Sloths spend about 90% of their life hanging upside down and typically only climb to the ground for bathroom breaks – once a week. cbsn.ws/3wNSt0P

Retired Marine Major General Mike Myatt became emotional talking about his visit with Gold Star parents. He rushed home instead of staying to remember their military hero. It’s a regret that he’s now redeeming, 60 Minutes reported in 2016. cbsn.ws/44WE7aQ

“I was told he died instantly,” Yolanda Vega said in 2016, talking about her son who served in Iraq and Afghanistan. Vega said she couldn’t have gotten through the experience without the support of Blue Star Moms. Memorial Day is observed today in the U.S. cbsn.ws/4bRlyas

A mother said she attended the funerals of 42 strangers to support military families whose children died in service. To mark Memorial Day, 60 Minutes spotlights Scott Pelley’s 2016 report on Gold Star parents. cbsn.ws/3x2BbNk

An early explorer said sloths were the stupidest animal he'd ever seen. But these hairy ninjas with their lousy eyesight and hearing are uniquely built to survive. cbsn.ws/4bxgcBx

Lucy Cooke’s latest book challenges the narrative that males are dominant and promiscuous in the animal kingdom, while females are submissive and monogamous.

The stopwatch has long been the symbol of 60 Minutes. But any measure of time is pointless for the subject of this story: the slow-moving sloth. cbsn.ws/4bQZzAt

Female sloths scream to attract a mate. Zoologist Lucy Cooke gives her best impersonation of the high-pitched shriek. cbsn.ws/3KfSRrV

Sharyn Alfonsi watched as an orphan sloth was released back into the wild.

“If she falls asleep in the middle of the release, is that a bad thing?” Alfonsi laughed during the slow getaway. cbsn.ws/3yIGXUP

“My heart rate is going up… I might start crying,” says zoologist Lucy Cooke as she spotted elusive Caribbean white tent-making bats. cbsn.ws/3R0pQEj

On Monkey Island, biologists are studying monkeys.

Their lives are halfway between the wild and captivity. Regularly, they are fed Purina Monkey Chow. (Yes, really, Monkey Chow). cbsn.ws/3WUzaxu

It’s still a mystery how a majority of the monkeys survived Hurricane Maria, a deadly Category 4 storm that battered Puerto Rico. cbsn.ws/4dQHWCD

About 500 monkeys were shipped 14,000 miles from India to Monkey Island in 1938 – giving scientists rare access to more than six decades of biological and behavioral data. cbsn.ws/3wZaXvb

Giant sperm whales sleep vertically suspended in the water. The reason for this sleep style is a mystery to researchers. cbsn.ws/3WYKloL

A whale researcher interprets the clicking sounds made by a massive sperm whale. cbsn.ws/3wPg7tE

A sperm whale, the size of a school bus, stared at our 60 Minutes crew. cbsn.ws/3KfM5Cx