This blog was written by Hannah De Frond. Hannah works with Ocean Conservancy and the University of Toronto Trash Team to manage the International Trash Trap Network (ITTN), a global network of local groups using trash traps to increase cleanup efforts, engage communities and inform upstream solutions.
The use of single-use plastics has grown significantly over the last few decades. Many of the plastics thrown away daily—such as plastic packaging, takeout cups, container lids, plastic bottles and grocery bags—are used just once before they are discarded.
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Incredibly, 80% of global marine litter items are made of plastics, primarily food and beverage items such as plastic bottles, bottle caps and lids. These items are also among the top 10 items most commonly collected by Ocean Conservancy’s International Coastal Cleanup® (ICC) volunteers around the world. So, what is it about plastic bottles, caps and lids that makes them so likely to enter the environment, and what can we do to prevent them from polluting our ocean?
Plastic bottles
Plastic bottles are the third most common type of plastic pollution collected throughout the nearly 40-year history of the ICC. From 1986-2023, ICC volunteers removed a staggering 24.3 million plastic bottles from coastlines around the world.
Ocean Conservancy estimates that 127 billion plastic bottles are used in the United States each year; due to their widespread use, they have become a major contributor to environmental pollution. Whole plastic bottles have even been found in the stomachs of an albatross and a sperm whale! As with all plastics, in the environment plastic bottles break up into microplastics that pose a threat to wildlife and potentially to human health as well. Most plastic bottles are made of a type of plastic called polyethylene terephthalate (PET). Though this material on its own is widely recyclable, many PET bottle designs use colored plastics and labels that can prevent them from being sorted or recycled correctly.
How can we tackle plastic bottle pollution?
Refillable beverage containers help reduce our reliance on single-use plastic bottles when we use them to transport tap water, fountain sodas, teas or other beverages. This alleviates the need for single-use beverage bottles each time a refillable container is used and eliminates the possibility that the plastic bottle might go to landfill or be leaked into the environment as pollution.
Policies such as extended producer responsibility (making producers responsible for the waste generated by the use of their plastic products) and deposit-return systems (also known as “bottle bills”) can encourage the redesign and reuse of plastic bottles, while holding the producers of plastic bottles accountable to help pay for the full lifecycle of their materials.
Plastic bottle caps
Along with plastic bottles come plastic bottle caps. When bottle caps are thrown into recycling bins separately from bottles, they are too small to be properly sorted at recycling facilities and instead often end up getting sent to landfill. Bottle caps that end up in the environment can have a considerable impact on marine life. Ocean Conservancy has identified plastic bottle caps as one of the top five deadliest forms of marine pollutionto large species such as seabirds, sea turtles and marine mammals, largely due to the harms of ingesting them. Plastic bottle caps can also generate microplastics when they degrade in the environment, but also from the twisting action used to remove a cap from its plastic ring. When bottles are repeatedly opened and closed from drinking, it potentially increases human exposure to microplastics.
How can we tackle plastic bottle cap pollution?
As with plastic bottles, switching to reusable and refillable beverage containers will reduce the amount of plastic bottle caps that are used and ultimately thrown away. When single-use plastic bottles and caps are used, to ensure that both the plastic bottles and caps get recycled the caps must be screwed back on before they are disposed of for recycling. Policy measures can encourage this behaviour: For example, in Europe it is now legally required for all caps on plastic bottles to be attached or tethered to the bottles. Drinking from bottles with the caps still attached has required some getting used to for consumers, but this subtle change is significantly improving bottle cap recyclability.
Plastic lids
Plastic lids like the ones that come with a cup of coffee, on a fountain beverage or on top of a yogurt container are some of the most commonly found single-use plastic items found on global beaches and waterways. Because of their size, plastic lids are too small or narrow for recycling sorting machines to manage. This means that instead, plastic lids often end up in landfills or burned in incinerators. In fact, plastic lids are the ninth most common type of plastic pollution collected in the history of Ocean Conservancy’s ICC. From 1986-2023, ICC volunteers have encountered and cleaned up more than 7.3 million plastic lids around the world. The United States alone uses more than 60 billion single-use plastic lids each year. That is enough for every adult in the United States to have a beverage with a plastic lid every day for eight straight months each year.
How can we tackle plastic lid pollution?
As with plastic bottles, the need for many plastic lids can be eliminated through investments in reuse or encouraging behavior changes to skip the lid or dispose of them properly. The most effective solution for lids is to transition to reusable cups and lids. Replacing one disposable coffee cup and lid every day for a year with a reusable mug would result in about 15 pounds of plastic waste prevented per person. Just imagine: If 100 million people did this—just under half of all adults in the United States—it would result in roughly 1.5 billion pounds of plastic debris prevented each year.
To reduce the impacts of plastic bottles, bottle caps, lids and other single-use plastics on our ocean we need to handle them better on land. We need to reduce the sheer volume of plastics produced and used, while holding plastic producers responsible for the harmful waste they have generated and continue to pump into the environment. Taking individual action and supporting local and national policies for the reduction, reuse, recycling and redesign of single-use plastic food and beverage items can help to keep our ocean plastic free.
To learn more about the most common types of plastic pollution entering our ocean and what you can do to help, check out our reports on charting a course to plastic-free beaches.
The post Plastic Bottles & Lids Among Top 10 Most Commonly Found Items at Cleanups appeared first on Ocean Conservancy.
Plastic Bottles & Lids Among Top 10 Most Commonly Found Items at Cleanups
After a slight delay of the Maria S. Merian caused by late-arriving containers our research cruise MSM142 finally got underway. By last Tuesday (24.03.2026), the full scientific team had arrived in Nuuk, the capital of Greenland, and the ship reached port on Wednesday (25.03.2026) morning. That same day, scientists and technicians moved on board and immediately began preparations, assembling and testing our instruments. Although the mornings on Wednesday and Thursday were grey and overcast, the afternoons cleared up beautifully. This gave us valuable time to organize equipment on deck and store empty boxes back into the containers before departure.
Given the forecast of harsh conditions outside the fjord, we carried out the mandatory safety drill while still in harbour. This included practicing emergency procedures and boarding the lifeboat. After completing border control, we were finally ready to leave Nuuk. We set sail on March 27th, heading into the Labrador Sea to begin our mission. Even before starting scientific operations, we tested the setup for deploying our gliders without releasing them during the transit out of the fjord. Once we reached open waters, we were met by high waves the following morning. For some on board, this was their first experience under such rough sea conditions. Seasickness quickly became a challenge for a few, while scientific work had to be temporarily postponed due to the strong winds and sea conditions. Together with the crew, we discussed how best to adapt our measurement plans to the given weather conditions. On March 29th, we were finally able to begin our scientific program with the first CTD deployment. A CTD is an instrument used to measure conductivity, temperature, and depth, which are key parameters for understanding ocean structure.
During the following night, we continued with additional CTD stations and successfully recovered two moorings: DSOW 3 and DSOW 4, located south of Greenland. These moorings carry instruments at various depths that measure velocity, temperature, and salinity. DSOW 4 was redeployed on the same day, while DSOW 3 followed the next day. In addition, the bottles attached to the CTD’s rosette can be used to collect water samples from any desired depth. These samples can be used, for example, to determine the oxygen content, nutrient levels, and organic matter.
Both are part of the OSNAP array, a network of moorings spanning the subpolar North Atlantic. On these moorings are a few instruments, for example microcats which measure temperature, pressure and salinity.
We then conducted around 25 CTD stations spaced approximately 3 nautical miles apart across an Irminger ring identified from satellite data. This high-resolution sampling was necessary to capture the structure of an Irminger Ring, which had a radius of about 12 km wide.
The days leading up to April 2nd were marked by very rough weather conditions. Life on board became both challenging and, at times, unintentionally entertaining sliding chairs were not uncommon. During the night from April 1st to April 2nd, winds reached 11 Beaufort with gusts up to 65 knots, forcing us to pause our measurements. Fortunately, conditions improved by morning, allowing us to resume our work. As well as with the help of the crew we had to adapt to the harsh weather conditions to continue our scientific work. On the 3rd of April, we were able to deploy a few gliders and one float. An ocean glider is an autonomous underwater Vehicle, which you can steer remotely and send to different locations, while it is measuring oceanographic key parameters.
This research cruise focuses on understanding small-scale processes in the ocean and their connection to the spring bloom, an essential phase in marine ecosystem in subpolar regions. Despite the challenging start, we have already gathered valuable data and look forward to the weeks ahead in the Labrador Sea.
Despite their dramatic name, false killer whales aren’t an orca species. These animals are dolphins—members of the same extended family as the iconic “killer whale” (Orcinus orca). Compared to their namesake counterparts, these marine mammals are far less well-known than our ocean’s iconic orcas.
Let’s dive in and take a closer look at false killer whales—one of the ocean’s most social, yet lesser-known dolphin species.
Appearance and anatomy
False killer whales (Pseudorca crassidens) are among the largest members of the dolphin family (Delphinidae). Adults can grow up to 20 feet long and weigh between 1,500 and 3,000 pounds, though some individuals have been recorded weighing even more. For comparison, that’s roughly double the size of a bottlenose dolphin—and slightly larger than a typical sedan.
These animals are incredibly powerful swimmers with long, torpedo-shaped bodies that help them move efficiently through the open ocean in search of prey. Their skull structure is what earned them their name, as their head shape closely resembles that of orcas. With broad, rounded heads, muscular jaws and large cone-shaped teeth, early scientists were fascinated by the similarities between these two marine mammal species.
Although their heads may look somewhat like those of orcas, there are several ways to distinguish false killer whales from their larger namesake counterparts.
One of the most noticeable differences has to do with their coloration. While orcas are known for their iconic black-and-white pattern with paler underbellies, alternatively, false killer whales are typically a uniform dark gray to black in color—almost as if a small orca decided to roll around in the dirt. If you’ve ever seen the animated Disney classic 101 Dalmatians, the difference is a bit like when the puppies roll in soot to disguise themselves as labradors instead of showing their usual black-and-white spots.
Their teeth also present a differentiator. The scientific name Pseudorca crassidens translates almost literally to “thick-toothed false orca,” a nod to their sturdy, cone-shaped teeth that help these animals capture prey. Orcas tend to have more robust, bulbous heads, while false killer whales appear slightly narrower and more streamlined.
Behavior and diet
False killer whales are both highly efficient hunters and deeply social animals. It’s not unusual to see them hunting together both in small pods and larger groups as they pursue prey like fish and squid.
Scientists have even observed false killer whales sharing food with each other, a behavior that is very unusual for marine mammals. While some dolphin and whale species work together to pursue prey, they rarely actively share food. The sharing of food among false killer whales spotlights the strong social bonds within their pods. Researchers believe these tight-knit social connections help false killer whales thrive in offshore environments where they’re always on the move.
Maintaining these close bonds and coordinating successful hunts requires constant effective communication, and this is where false killer whales excel. Like other dolphins, they produce a variety of sounds like whistles and clicks to stay connected with their pod and locate prey using echolocation. In the deep offshore waters where they live, sound often becomes more important than sight, since sound travels much farther underwater than light.
Where they live
False killer whales are highly migratory and travel long distances throughout tropical and subtropical waters around the world. They prefer deeper waters far offshore, and this pelagic lifestyle can make them more difficult for scientists to study than many coastal dolphin species.
However, there are a few places where researchers have been able to learn more about them—including the waters surrounding the Hawaiian Islands.
Scientists have identified three distinct groups of false killer whales in and around Hawaii, but one well-studied group stays close to the main Hawaiian Islands year-round. Unfortunately, researchers estimate that only about 140 individuals remained in 2022, with populations expected to decline without action to protect them. This is exactly why this group is listed as endangered under the U.S. Endangered Species Act and is considered one of the most vulnerable marine mammal populations in U.S. waters.
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Current threats to survival
False killer whales are currently listed as Near Threatened on the IUCN Red List. From climate change-induced ocean acidification and harmful algal blooms to marine debris and fishing bycatch, false killer whales face the same mounting pressures that are impacting marine ecosystems around the world. As their prey becomes scarce due to increasing threats, populations of top predators like these decline, serving as a powerful signal that the ocean’s overall health is in critical need of protection.
Here at Ocean Conservancy, we’re working daily to confront these threats head-on and protect the ecosystems and wildlife we all cherish so dearly. But we can’t do it without you. Support from ocean lovers is what powers our work to protect our ocean, and right now, our planet needs all the help it can get. Visit Ocean Conservancy’s Action Center today and join our movement to create a better future for our ocean, forever and for everyone.
The post All About False Killer Whales appeared first on Ocean Conservancy.
https://oceanconservancy.org/blog/2026/03/31/false-killer-whales/
A lot has happened in the meantime: I became an Associate Professor at the University of Southern Denmark, we all lived through the Corona period, then slowly adjusted to the post‑pandemic stability, only to find ourselves again in turbulent political times. I am now affiliated with the Marine Research Center in Kerteminde, a beautiful coastal town on the island of Fyn. My plan is to share small updates on my research and activities every now and then. So let’s start with yesterday’s sampling trip for benthic phytoplankton, carried out by my colleague, Prof. Kazumasa Oguri. The sampling will help prepare for the first‑semester bachelor students who will join his small but fascinating project. This project is all about the benthic diatoms that form dense, photosynthetic communities on tidal‑flat sediments. Their daytime oxygen production enriches the sediment surface and allows oxygen to penetrate deeper, supporting diverse organisms that rely on aerobic respiration. The project will explore how oxygen distribution and oxygen production/consumption in sediments change under different light conditions (day, night, sunrise/sunset). The team will incubate benthic diatom communities in jars and measure oxygen profiles using an oxygen imaging system under controlled light regimes.
Yesterday, we visited several potential sampling sites where students can carry out their fieldwork. I encourage all PIs in our group to define at least one small project related to Kerteminde Fjord, where our laboratories are located. Over time, I hope we can build a more integrated dataset describing the marine and coastal ecosystems of the area.
Another activity currently in preparation is a project on marine invasive species in Kerteminde, which will feed into a course I will run in July and a master’s thesis project. More will come later.
Let’s hope for a more continuous blog from here on, keeping track of our activities, with or without jellyfish!
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