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I recently received my copy of the companion book to the Our Planet documentary series to be aired soon on Netflix. It's a big book, over 300 pages, with lots of photos. I haven't had time to read it yet, but a quick glance through tells me it's worth spending some time on. If you get a copy, one of my sperm whale (Physeter macrocephalus) photos appears as a double-page spread: I also have a 9-page feature in the April 2019 issue of BBC Wildlife magazine:

He has a comfortable terrarium home, heated to a constant 28ºC. I also invested in a portable fenced-in area, which I bought with the idea that I could let him play unsupervised while I work. He takes turtle-food pellets directly from my fingertips, one by one, gently, though sometimes he clamps down by accident. For example, a little over a week ago, Oogway crawled into the front pocket of my hoodie (the kind of pocket that is like a tunnel, with openings on two sides for both your hands) and fell asleep. He crawled up and into my left pocket, adjusted things to make himself comfortable, then went to sleep.

I took the photo above, admired the pretty colours, read up a little bit about the species (Olinidias formosus, common name = flower hat jellyfish, ハナグサクラゲ), but otherwise didn't give it much thought. As it turns out, researchers published a paper* in 2015 describing how this jellyfish uses fluorescence to attract prey. If you're interested in reading more, click over to the Biographic write-up, or if you're super-keen, you can read the paper online here, or download a PDF from this link. Fluorescent proteins function as a prey attractant: experimental evidence from the hydromedusa Olindias formosus and other marine organisms, Biology Open (2015) 4, 1094-1104 doi:10.1242/bio.012138

Ever wonder what a humpback whale’s tail slap looks like underwater? Pictured here is an adult humpback whale executing a reverse tail-slap, which is when the whale positions itself with its ventral surface (belly) facing up toward the ocean surface and curls its peduncle area (rear end) upward, then reverses the direction of its tail with a powerful snap. Given repeated smacking of the whale’s fluke against the ocean surface, accompanied by the powerful follow-through, there is a lot of whitewater created by air that unexpectedly finds itself submerged. For context, the second photo is what it looks like above water as a humpback whale prepares to swing its fluke down.