Forester Frans Kapteijns shares his knowledge of nature every week. Everyone can submit questions via [email protected]. This time Frans pays attention to mysterious white balls in the garden and a bird that has flown against the window.
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During a walk, an animal fell on the back when the hair is combing, what is it?

A tree -string Saxifraga (photo: ab. Boss).
A tree -string Saxifraga (photo: ab. Boss).

The Lakeman family discovered a striking insect while walking, which had fallen on his back. It turns out to be a horseshoe, a tree -pants. They are black with orange -red spots, have red -brown small wings and can become a maximum of ten millimeters in size.

This bug mainly lives in trees and shrubs, but also like to eat aphids and mites. In our country you can see this type of bug most from July to October on trees and bushes and then both on foliage and coniferous trees. There are mites, aphids and other small insects on the menu. If they can’t find it, they will switch to sucking plant juice. After mating, the females lay their eggs in holes in stems of plants.

This little bird flew against the window, what is the name of this species?

A colorful fly catcher (photo: M. Emons).
A colorful fly catcher (photo: M. Emons).

A small bird flew against the window with Mr. or Mrs. Emons. The bird was then lovingly taken inside and was able to go into nature again the next morning. On the feather suit, the white chest and the brown -row back, it is a colorful fly catcher. This songbird – white of chest and with a gray back – is a real insect hunter and increasingly seen in our country. The last count even indicated that 26,000 breeding pairs had been counted in our country.

They prefer to breed in tree cavities and especially in old woodpeckers. Bonte flycatchers pay a lot of attention to their nests. They cover the inside with horsehair and sometimes with feathers from other birds. If you have ever seen such a colorful flycatcher catch a prey, you will never forget that again. Spieding from their sitting posts, they make short flights behind flying insects and catch them in full flight.

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What kind of doll is on my fence?

A doll of presumably a Windpijltaart (photo: Marcel Kersten).
A doll of presumably a Windpijltaart (photo: Marcel Kersten).

There was also something special to be found in Marcel Kersten’s garden: a large cocoon on the fence. So there was no doll, but a cocoon with a doll in it. I think that of a Windpijlstaart. The doll of a butterfly occurs after a caterpillar has eaten. Such a caterpillar in the final stage, then changes to pop, but also ensures that there is protection. And we call that protection a cocoon. Such a doll usually consists of silk, somewhat harder material or other material.

A Windpijlstaart (photo: Sjan Arts).
A Windpijlstaart (photo: Sjan Arts).

Windpijltaarten are moths and can have a wingspan of up to twelve centimeters. What is special is that Windepijltaarten can reach a speed of 100 kilometers per hour over a short distance, but often the average speed is around 50 kilometers per hour. In principle, they are pull butterflies from southern Europe, but they are increasingly found in our country.

What was on the leaf of my petunia?

Eggs of presumably a weapon carrier (photo: Mia Smolders).
Eggs of presumably a weapon carrier (photo: Mia Smolders).

Mia Smolders found mysterious balls on a leaf of a Petunia Million Bells. I think these are the eggs of the weapon carrier, a moth that owes its name to the shield -like pattern on its wings.

Just like with all other butterflies, the mating of these moths takes place by connecting with the behindlings against each other. In the case of the weapon carrier, it may be that they are connected to each other for two days. After that the eggs are only laid.

Mating weapons (photo: Theo Zelen).
Mating weapons (photo: Theo Zelen).

My neighbor found a great appearance, but what is the name of this insect?

Léon Beelen was in his holiday home in Friesland when his neighbor showed him a picture of and separately insect. She wanted to know what the name is and Léon knows Stuifmail and hopes that Frans knows.

I immediately saw that it was a fly, but still had to get the books. I think it’s a Coenosia Tigrina, which is also called a killer fly or regular tiger fly. This is due to the tiger -like and predatory nature of this fly. This sturdy hunter catches other flies in the air and thus lends nature – and even cash farmers – a hand. Because in greenhouses, these robbery flies go looking for fly larvae.

A Coenosia Tigrina, normal tiger fly (Léon Beelen).
A Coenosia Tigrina, normal tiger fly (Léon Beelen).

A Coenosia Tigrina Saxifraga (photo: Tom Heijnen).
A Coenosia Tigrina Saxifraga (photo: Tom Heijnen).

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