One cold December day in 2021, Colorado carnivorous plant grower Jeremiah Harris shared some pictures of wild Amazonian giant water lilies (Victoria amazonica) plants in the Inírida River in Guainía, Colombia to Instagram. There’s just one problem. No known Victoria water lily species grow there. 

When water lily expert Carlos Magdalena saw the post on Instagram, he suspected a new plant species could be involved. To investigate the matter, he used satellite imagery to remotely search the Inírida River and its surrounding lakes and confirmed the presence of Victorias.

And yes, you can see these enormous plants from space. Victorias grow the world’s second largest single plant leaf. 

Magdalena is a botanical and scientific research horticulturist at the Royal Botanic Gardens, Kew in the U.K. Along with his colleagues, the team went on a five-day expedition to Inírida. The team included members of the Indigenous reserves del río Atabapo, one of whom had seen the lilies during his childhood. 

However, the trip didn’t exactly go according to plan. By their last night, they had found only two water lily plants, neither of which had flowers. This was a problem, because botanists need a flower to differentiate species. As if that wasn’t bad enough, the water lilies they found seemed to be struggling with a late rainy season. 

But when Magdalena described their situation to the expedition’s boat captain, Gustavo Melo, he said he knew where they could find more of this water lily. They didn’t have much time to do so, with the team’s flight back to Bogotá was at 9:00 a.m. the next morning. Thus at 1:00 a.m., Melo, a member of the Indigenous Tucano community, led them to a small lake. There, they found five more Victorias, one of which was blooming. 

“This is one of those extraordinary stories where indigenous and horticultural knowledge with the help of social media and technology came together to uncover a truly extraordinary botanical achievement,” Magdalena said in a statement. 

The  researchers were able to collect what they needed to start the official scientific description of the new species: Victoria colombiana. They even managed to make that early flight. In their recent study published in the journal Phytotaxa, he and his colleagues also announced the discovery of another new Victoria species, Victoria mattogrossensis. 

The team estimates that there are only between 30 and 50 wild V. colombiana plants, and is extremely vulnerable to extinction. They are currently working to get the plant officially categorized as Critically Endangered by the IUCN Red List. 

“Now that we know this water lily exists, our responsibility is to understand it better and protect it. With so many plants in the wild threatened with extinction, we simply cannot wait any longer to take action,” Magdalena added. Experts are considering starting a naturalized population in a more accessible lake in Indigenous territory and researchers also are hoping to cultivate the species in Bogotà.

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When zoology professor Daniel Baldassarre traveled to the remote Galápagos Islands of Wolf and Darwin with two other researchers, getting there proved quite a challenge. With no beaches to land a boat on, they had to approach the islands’ cliffs in a small dinghy and wait for a lull in the waves before jumping onto sharp, black lava rocks.

But their efforts paid off. On that trip, they saw a bird that very few people have ever set eyes on in the wild: the vampire ground finch. These finches are only found on Wolf and Darwin, and feed on the blood of much larger birds called Nazca boobies that also live on the islands. 

Up close, Baldassarre and his colleagues noted the vampire finches’ blood-stained bills and their throats visibly engorged with blood. They also saw them in action. 

“We observed scores of vampire finches clamouring all over the backs, tails, and wings of boobies, opening up substantial wounds with their sharp beaks, and drinking their fill of blood,” they wrote in an article for The Conversation. 

Why only some birds drink blood

“Blood is a notoriously difficult food source to process and extract nutrients from, which probably partly explains why so few animals have evolved to feed on it,” Baldassarre tells Popular Science. He suspects that on these islands where freshwater is extremely rare, blood might serve as a water source for the finches. 

It’s not the only component of the vampire finches’ diet, however. Based on unpublished data collected by Baldassarre and his colleagues, blood makes up about one-tenth of the vampire finches’ diet. 

“These finches are quite opportunistic, so they will eat just about anything they can find,” Baldassarre says. “We observed them feeding on everything from seeds to insects to broken seabird eggs.”

One theory is that vampire finches rely more on blood feeding in periods of extreme drought, when other resources are scarce. But more research is needed to see if this idea holds up in practice.

How this strange behavior evolved

Vampire finches weren’t always vampires, scientists think. The relationship between vampire finches and boobies probably started off with the finches eating parasites found on the skin and feathers of the boobies. This would have been mutually beneficial because it provided a cleaning service for the boobies and food for the finches.

But at some point in evolutionary history, in the process of picking off parasites, the finches started to create lesions on the boobies’ skin, and eventually began feeding on their blood.

Over time, their bills became more scalpel-like, perfect for making skin incisions. Their digestive system also changed. When Baldassarre and his colleagues studied the microbes found in vampire finches’ guts, they found that their gut microbiome was very different from that of other, non-blood-consuming finches on the Galápagos Islands, something they attribute to their unique diet. 

Until recently, vampire finches were considered a subspecies of the sharp-beaked ground finch (Geospiza difficilis). 

“But they have now been designated as their own species [Geospiza septentrionalis] because of the differences they have evolved because of blood feeding,” Baldassarre notes. 

How the boobies cope 

Baldassarre and his colleagues have seen vampire finches gang up on and kill nestling boobies,“but that was quite rare,” he points out. 

“In most cases, the finches seem to inflict just enough damage to break the skin and extract some blood, but not too much to harm the boobies significantly.” This is similar to many parasite-host relationships, such as fleas, ticks, and mosquitoes on mammals. “You can kind of think of the vampire finches as giant mosquitoes,” Baldassarre says.

As seen in a segment on vampire finches in David Attenborough’s documentary A Perfect Planet, the boobies seem to tolerate the vampire finches rather than chasing them away. There are likely a few reasons for this, Baldassarre says. 

“For one, as in large animals being bitten by mosquitoes, often the damage is minimal and not noticeable, so it doesn’t elicit a strong reaction. Also, the boobies sometimes have a vested interest in staying put and guarding their spot in the colony, or perhaps nest or nestlings, so may not want to fly away. Finally, the finches seem to target hard-to-reach areas on the boobies like the base of tail feathers, so it’s likely difficult for the boobies to deter them.”

I, for one, was feeling very sorry for the boobies being constantly hounded by these small vampire birds. Until I learnt that Nazca boobies practice something called “obligate siblicide,” which essentially means that the first-hatched chick routinely attacks and kills its younger sibling. It’s a harsh, bird-eat-bird world in the Galápagos Islands. 

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