The elephant brain weighs about 6,000g.
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One in three dog owners say they have talked to their pets on the phone.
427
Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
23
When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23