Country diary: even the dowdiest day-flying moths deserve a closer look

There are significantly more species of day-flying moths in the UK than there are butterflies – over twice as many large “macro moths”, plus a number of smaller, harder to identify “micro” species – but they are often overlooked in favour of their more familiar cousins.

It’s impossible to ignore the hummingbird hawkmoth darting back and forward between my buddleia bushes in the company of another summer visitor, a silver Y. As it hovers with an audible hum, supping nectar through its inch-long curved proboscis, I can see why this spectacular migrant is easily mistaken for its namesake. Though unrelated, both creatures have evolved similar traits – a perfect example of convergent evolution.

As I walk through the knee-high grass of my unmown lawn, I disturb a white plume. At rest, the moth’s narrow, spurred wings are held out at right angles, but as it flutters weakly around my legs it splays the feathery plumes, like a tiny angel.

The white plume moth has the appearance of a tiny angel.

Not all day-flyers are so striking at first glance. At a distance, the mint moths that throng my garden mints and nepetas appear a nondescript brown, but up close their forewings shimmer a rich reddish-purple, each adorned with a single golden spot.

UK moth populations are in steady decline and the situation is particularly dire here in the south, where numbers have fallen by 40% since 1968. The garden tiger was, as its name suggests, once commonly found in gardens, but this species has declined by 92%. Until now, I’ve only ever encountered them in the Highlands of Scotland, so it’s a shock to spot an individual among the nectaring red admiral and peacock butterflies.

As my shadow falls across it, its giraffe-patterned brown and cream forewings flick up and it flashes a warning with its vermilion hindwings. At the same time, it exposes a fringe of red hairs at the base of its head. This conspicuous colouration isn’t an empty threat: the moth can secrete an irritant liquid from two glands at the front of its thorax and its body fluids contain neurotoxins – enough to put off the hungriest potential predator.

I step back and watch as it flits up and over the fence, wondering when, or indeed if, I will ever encounter another of these bold beauties on my home patch.

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