Dozens of zoo animals in Sudan's capital — including an elderly crocodile, parrots and giant lizards — are feared dead after street battles between the country's rival forces made the location unreachable.

At least 100 animals, all kept inside enclosures, will have gone more than three weeks without food or water, said Sara Abdalla, the head zoologist at the zoo, which is part of the Sudan Natural History Museum.

Mexican officials and the conservation group Sea Shepherd said Monday that experts will set out in two ships in a bid to locate the few remaining vaquita marina, the world's most endangered marine mammal.

Mexico environment secretary said experts from the United States, Canada and Mexico will use binoculars, sighting devices and acoustic monitors to try to pinpoint the location of the tiny, elusive porpoises. The species cannot be captured, held or bred in captivity.

A U.S. agency has agreed to an in-depth environmental study into whether dredging a Georgia shipping channel in the spring and summer would threaten rare sea turtles nesting on nearby beaches — a review demanded by conservationists who sued to stop the project.

Georgia conservation group One Hundred Miles moved to dismiss its lawsuit against the Army Corps of Engineers after the agency announced Friday that it would voluntarily conduct the study. The group sued in December, asking a U.S. District Court judge to order the Corps to produce such a report.

Daily tides stoked with increasingly warmer water ate a hole taller than the Washington Monument at the bottom of one of Greenland's major glaciers in the last couple years, accelerating the retreat of a crucial part of the glacier, a new study found.

And scientists worry that the phenomenon isn't limited to this one glacier, raising questions about previous projections of melting rates on the world's vulnerable ice sheets.

Australian scientists have begun vaccinating wild koalas against chlamydia in an ambitious field trial in New South Wales.

The aim is to test a method for protecting the beloved marsupials against a widespread disease that causes blindness, infertility and death.

After his swearing-in ceremony on Jan. 1, Brazil's Luiz Inácio Lula da Silva walked up the ramp to the presidential palace arm in arm with Indigenous leader Raoni Metuktire, instantly recognizable by his yellow headdress and wooden lip plate.

But a major railway that would accelerate deforestation in Metuktire's ancestral land risks souring relations between the leftist leader and the chief of the Kayapó people. And it's just one of several mega-projects that activists and experts say would devastate the natural world — and seriously dent Lula's newfound image as a defender of the environment — if they proceed.

Drought-stricken Spain says last month was the hottest and driest April since records began in 1961.

The State Meteorological Agency, known by the Spanish acronym AEMET, said Monday the average daily temperature in April was 14.9 degrees Celsius (58.8 Fahrenheit), that is 3 degrees Celsius above the average.

Major financial firms that publicly support efforts to limit global warming have billions invested in the world's largest oil and gas companies -- including in some of their products marketed as green -- a new report said Friday.

The analysis found that 25 members of the Net Zero Asset Managers' initiative have a combined $417 billion in holdings in 15 oil and gas firms, including ExxonMobil and TotalEnergies.

With sea surface temperatures swelling to new highs in recent weeks, scientists warn that humanity's carbon pollution has the potential to turn oceans into a global warming "time bomb".

Oceans absorb most of the heat caused by planet-warming gases, causing heatwaves that harm aquatic life, altering weather patterns and disrupting crucial planet-regulating systems.

Global energy firms should help fill a $29-million gap in funding to safely remove oil from an abandoned tanker off Yemen's coast, the war-ravaged country's largest private company said Thursday.