Bloodthirsty by Thomas P. Peschak, Germany/South Africa — winner, Behaviour: birds. When rations run short on Wolf Island, in the remote northern Galápagos, the sharp-beaked ground finches become vampires. Their sitting targets are Nazca boobies and other large birds. The finches rely on a scant diet of seeds and insects, which regularly dries up, so they drink blood to survive. ‘I’ve seen more than half a dozen finches drinking from a single Nazca booby,’ says Tom. Rather than leave their nests the boobies tolerate the vampires, and the blood loss doesn’t seem to cause permanent harm. (Photo by Thomas P. Peschak/2018 Wildlife Photographer of the Year)

Angora rabbit Emilson sits next to its freshly shaved hair at Georgia Spausta's small farm in Herzogbirbaum, Austria March 10, 2015. Spausta produces hand-spun yarn from some 25 angora rabbits which is sold in small scale to enthusiasts or at local markets. The rabbits are clipped four times a year, each time giving some 300 grams of wool, about the amount needed to knit one pullover. (Photo by Heinz-Peter Bader/Reuters)

A goose has terrorized students at the University of Warwick, Coventry, UK, on May 22, 2013. The bird built its nest near a block of student apartments and attacks anyone who goes near the nest. (Photo by Caters News/The Grosby Group)

Villagers play traditional games as they take part in a Chyrachka rite during the Shrovetide celebration in the village of Tonezh, some 280 km of Minsk, on March 10, 2019. Chyrachka is a kind of birds that live in this area. (Photo by Sergei Gapon/AFP Photo)

A man transports chicken on a motorscooter to the chicken market in Kathmandu, Nepal, 07 February 2023. Cases of bird flu, or avian influenza, infections have been confirmed in three places in the Kathmandu Valley, according to the Ministry of Agriculture and Livestock Development (MoALD), causing a drop in sales of chicken in the valley after the spread of the flu news. (Photo by Narendra Shrestha/EPA)

Costumed revelers walk through a street prior to the carnival parade in the village of Vevcani, in the southwestern part of North Macedonia, on Wednesday, January 13, 2021. The coronavirus pandemic has disrupted the usual carnival celebrations which have been taken place for centuries in the tiny North Macedonian town of Vevcani. A few hundred locals gathered at the small town square to celebrate the carnival, but police dispersed the gathering after a brief scuffle with a small group. No arrests or injuries were reported. (Photo by Boris Grdanoski/AP Photo)

A moon light illuminates the sky through the clouds over a large line of grass between some home houses in the small village of Tafalla, northern Spain, Tuesday, May 1, 2018. (Photo by Alvaro Barrientos/AP Photo)