Hummingbirds of the Costa Rican mountains


This 7 December 2018 video says about itself:

A hummingbird needs to consume at least its body weight in nectar each day. High in the Talamanca Mountains of Costa Rica, the competition for food is fierce.

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Many sea turtles at Costa Rican beach


This 25 November 2018 video says about itself:

A Mass Synchronized Nesting Event | Jaguar Beach Battle

The arribada finally begins on the Nancite Beach of Costa Rica, a mass synchronized nesting event for three days where tens of thousands of female Olive Ridley sea turtles return to the beach they were born to lay their own eggs.

LGBTQ rights victory in Costa Rica


This 2 July 2018 video says about itself:

Hey everyone! I’m glad you passed by. This was how we celebrated Pride in Costa Rica. This video was recorded with a Canon 80D.

Now after Ireland, after Cuba, Costa Rica?

Translated from Dutch NOS TV today:

LGBTQ Costa Ricans will be able to marry in one and a half year’s time

The Supreme Court in Costa Rica has declared the ban on gay marriage unconstitutional. The parliament now gets a year and a half to come up with a law that allows same-sex marriage. If that does not work, marriages between men and men and women and women will automatically become legally valid.

The ruling is in line with the judgment of the Inter-American Court for Human Rights. That decided in January that all member states must recognize gay marriage.

That verdict became an important theme in the presidential elections in April. The conservative candidate Fabricio Alvarado Muñoz, an evangelical preacher, spoke out against gay marriage.

The winner, the leftist candidate Carlos Alvarado Quesada, presented himself as a supporter. He is therefore pleased with the decision. “Nobody should be discriminated against here because of sexual orientation”, he said.

Baby sloth rescued in Costa Rica


This National Geographic video says about itself:

Baby Sloth Is Rescued in Costa Rica | Nat Geo Wild

2 May 2018

A baby sloth was found pinned between two rocks and calling out for help. Rescuers carefully came to the two-toed sloth‘s aid.

Intelligence helping Costa Rican hummingbirds


This video says about itself:

7 February 2018

New experiments show that dominant male Long-billed Hermits have better spatial memories and sing more consistent songs than less successful males, according to research published in the journal Scientific Reports.

From the Cornell Lab of Ornithology in the USA today:

It’s Brains Over Brawn for Male Long-billed Hermits Seeking Mates

In the glitzy world of hummingbirds, one species seems to profit more from mental prowess than physical flamboyance. For male Long-billed Hermits in Costa Rica, having a good spatial memory is a key factor in winning prime display spots. See the full story here.

Panamanian lizards, new study


This video says about itself:

On this episode of Breaking Trail, Coyote and the crew are in search of the mysterious Water Anole!

Deep in the rainforests of Costa Rica lives a very specialized reptile, the elusive Water Anole. These Anoles are not only beautiful with their cryptic patterns and brilliantly striped dewlaps but they also have the unique ability to live right on the surface of waterfalls!

In fact that’s the only place these lizards live and this reality makes them extremely difficult to track down since the waterfalls of the Osa Peninsula can be so remote and treacherous…but of course, and it goes without saying, this small little detail isn’t going to stop the Brave Wilderness crew who have their minds set on getting a much closer look at one of these rare rainforest “dragons”. Now the only question is, will Coyote actually be able to catch one? Get ready for our most exciting rainforest adventure yet!

From Arizona State University in the USA:

Why are there so many types of lizards?

Study sheds light on biodiversity of Anole lizard family trees

February 23, 2018

Summary: Researchers have sequenced the complete genetic code — the genome — of several vertebrate species from Panama. They found that changes in genes involved in the interbrain (the site of the pineal gland and other endocrine glands), for color vision, hormones and the colorful dewlap that males bob to attract females, may contribute to the formation of boundaries between species. Genes regulating limb development also evolved especially quickly.

Lizards have special superpowers. While birds can regrow feathers and mammals can regrow skin, lizards can regenerate entire structures such as their tails. Despite these differences, all have evolved from the same ancestor as lizards.

Spreading through the Americas, one lizard group, the anoles, evolved like Darwin’s finches, adapting to different islands and different habitats on the mainland. Today there are more than 400 species.

Constructing a family tree for three lizard species collected in Panama at the Smithsonian Tropical Research Institute (STRI) and a fourth from the southeastern U.S., scientists at Arizona State University compared lizard genomes — their entire DNA code — to those of other animals.

The researchers discovered that changes in genes involved in the interbrain (the site of the pineal gland and other endocrine glands), for color vision, hormones and the colorful dewlap that males bob to attract females, may contribute to the formation of boundaries between species. Genes regulating limb development also evolved especially quickly.

“While some reptiles such as tortoises changed remarkably little over millions of years, anole lizards evolved quickly, generating a diversity of shapes and behaviors”, said Kenro Kusumi, corresponding author and professor at ASU School of Life Sciences. “Now that sequencing entire genomes is cheaper and easier, we discovered molecular genetic evidence for rapid evolution that may account for striking differences between bodies of animals living in different environments.”

Kusumi’s lab, working with colleagues at the University of Arizona College of Medicine-Phoenix, is especially interested in how reptiles’ genomes shape their ability to regenerate and to develop a diversity of body forms.

“This is the first time the complete genetic code — the genome — of any vertebrate species from Panama has been sequenced and analyzed”, said Oris Sanjur, co-author and Associate Director for Science Administration at STRI. “Information from these three species is an important contribution to our understanding of biodiversity and the evolution of new species.”

Scientists estimate that there are 40 species of anolid lizards living in Panama, compared to only one in the U.S. A team from ASU collected three species with permission from the Ministry of the Environment, MiAmbiente: the Central American giant anole, Anolis frenatus, lives high on tree trunks; the grass anole, A. auratus, perches on bushes or on grassy vegetation and the slender anole, A. apletophallus, found only in Panama, hangs out lower on tree trunks or on the ground.

Researchers at ASU’s School of Life Sciences lined up the DNA sequences of the lizards with the DNA sequences of 31 other animals: the lobe-finned fish and the four-legged animal groups that evolved from them. They also took a careful look at genes that code for proteins: more than 22,000 genes in the green anole, A. carolinensis, versus approximately 20,000 identified each in A. auratus and A. frenatus and 13,000 in A. apletophallus.

One obvious explanation for a faster rate of evolution is the anole lizards’ faster rate of reproduction. Anoles typically mate in their first year of life, while other reptiles take much longer to reach sexual maturity. They also breed with many other individuals so mutations that make it difficult for individuals to survive are eliminated fairly quickly.

The first and only other anole lizard to be sequenced previously was the green anole, A. carolinensis, the only anole species resident in the U.S. In that study from MIT, the A. carolinensis genome held evidence of more recent evolution and the loss of ancient repeated elements in the part of the DNA that does not code for proteins. In this sense, it was important to sequence the three Panamanian species, because the U.S. species may not be the most representative of the diverse anole group.

“For 15 years, an impressive amount of time and money poured into discovering the genomes of mammals, motivated by our drive to understand human evolution and to look for cures for disease. Even though the squamate reptiles include more than 10,000 species — almost double the number of mammal species — a single genome was not enough to understand the variability within this group”, said the first author of the report, Marc Tollis, a post-doctoral fellow at ASU.

“By comparing these four anole lizard genomes, we’re beginning to understand how one of the most diverse groups of vertebrates regenerate, develop and diversify”, he added.