Eye on Nature: the males call cuck-coo, mutant grasshoppers and micro-moths

Your notes and queries for Eanna Ní Lamhna

Reader Marty Mc Donald took this lovely photo of a breeding kingfisher in Wicklow.
Reader Marty Mc Donald took this lovely photo of a breeding kingfisher in Wicklow.

The other day I rescued a cuckoo that crashed into my house window. After a few hours she was ready to fly away. - Thelma Banks, Dromahair, Co Leitrim

Cuckoos are rarely seen, so this was an unusual encounter. There is little difference between males and females, but only the males call cuck-coo. Hold back on polishing the window glass for a while.

Cuckoo
Cuckoo

Did you ever see a rare mutant grasshopper? I saw two of them in our field recently in east Cork. - Gavin Mc Grath

No, I have never seen these, so far. Apparently, the pink colouring is caused by a rare genetic mutation called erythrism similar to albinism. This is a wingless nymph stage of the field grasshopper. This rare mutation can also happen in the meadow grasshopper, but this species has not been recorded as occurring in Ireland.

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Is this pink grasshopper a mutant?
Is this pink grasshopper a mutant?

Can you identify these caterpillars? Are they rare or invasive? - Margaret Wynne, Rathmines, Dublin

This is the time of year for these native caterpillars, which cover particular small trees with silk webbing and proceed to defoliate them. They are micro-moths; their caterpillars can wriggle backwards when the head is touched, unlike the caterpillars of the macro-moths, which cannot perform such athletic feats. These ones are small ermine caterpillars, most likely the orchard ermine. Even though heavily defoliated, the trees will recover.

Leaf-eating small ermine caterpillars, most likely the orchard ermine.
Leaf-eating small ermine caterpillars, most likely the orchard ermine.

We recently came across many clusters of these tiny objects on Gormanston beach and wondered what they were? - From a reader in Co Meath

These are the shells, properly called tests, of the sea potato. They can be up to 9cm long but are often smaller. This is a sea urchin, which lives in deeper waters and burrows into clean sand. When living, it is covered in a layer of yellowish-brown spines. It is a deposit feeder.

The shells, properly called tests, of the sea potato
The shells, properly called tests, of the sea potato

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